diff --git a/core/src/net/sf/openrocket/rocketcomponent/FlightConfiguration.java b/core/src/net/sf/openrocket/rocketcomponent/FlightConfiguration.java
index 5f5ad884e..d8a7ff2d4 100644
--- a/core/src/net/sf/openrocket/rocketcomponent/FlightConfiguration.java
+++ b/core/src/net/sf/openrocket/rocketcomponent/FlightConfiguration.java
@@ -424,7 +424,7 @@ public class FlightConfiguration implements FlightConfigurableParameter<FlightCo
 
 		this.stages.clear();
 		for (AxialStage curStage : this.rocket.getStageList()) {
-			
+			if (curStage == null) continue;
 			StageFlags flagsToAdd = new StageFlags( curStage.getStageNumber(), true);
 			this.stages.put(curStage.getStageNumber(), flagsToAdd);
 		}
diff --git a/core/src/net/sf/openrocket/rocketcomponent/ParallelStage.java b/core/src/net/sf/openrocket/rocketcomponent/ParallelStage.java
index eab90c87f..8f74ee6fa 100644
--- a/core/src/net/sf/openrocket/rocketcomponent/ParallelStage.java
+++ b/core/src/net/sf/openrocket/rocketcomponent/ParallelStage.java
@@ -204,7 +204,14 @@ public class ParallelStage extends AxialStage implements FlightConfigurableCompo
 			}
 		}
 
-		setRadius( radiusMethod, radius_m );
+		if (radius_m == this.radiusOffset_m) return;
+
+		if (this.radiusMethod.clampToZero() ) {
+			this.radiusOffset_m = 0.0;
+		} else {
+			this.radiusOffset_m = radius_m;
+		}
+		fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
 	}
 
 	@Override
@@ -229,16 +236,15 @@ public class ParallelStage extends AxialStage implements FlightConfigurableCompo
 		}
 
 		mutex.verify();
-		
-		RadiusMethod newMethod = requestedMethod; 
+
 		double newRadius = requestedRadius;
 		
-		if( newMethod.clampToZero() ) {
+		if( requestedMethod.clampToZero() ) {
 			newRadius = 0.;
 		}	
 
-		this.radiusMethod = newMethod;
-		this.radiusOffset_m = newRadius;
+		this.radiusMethod = requestedMethod;
+		this.radiusOffset_m = this.radiusMethod.getAsOffset(getParent(), this, newRadius);
 
 		fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
 	}
@@ -267,14 +273,18 @@ public class ParallelStage extends AxialStage implements FlightConfigurableCompo
 	}
 
 	@Override
-	public void setRadiusMethod(RadiusMethod newRadiusMethod) {
+	public void setRadiusMethod(RadiusMethod newMethod) {
 		for (RocketComponent listener : configListeners) {
 			if (listener instanceof ParallelStage) {
-				((ParallelStage) listener).setRadiusMethod(newRadiusMethod);
+				((ParallelStage) listener).setRadiusMethod(newMethod);
 			}
 		}
 
-		setRadius( newRadiusMethod, this.radiusOffset_m );
+		if (newMethod == this.radiusMethod) return;
+
+		mutex.verify();
+		double radius = this.radiusMethod.getRadius(getParent(), this, this.radiusOffset_m);	// Radius from the parent's center
+		setRadius(newMethod, radius);
 	}
 	
 	
diff --git a/core/src/net/sf/openrocket/rocketcomponent/PodSet.java b/core/src/net/sf/openrocket/rocketcomponent/PodSet.java
index 0fb50ee9e..d05b277d2 100644
--- a/core/src/net/sf/openrocket/rocketcomponent/PodSet.java
+++ b/core/src/net/sf/openrocket/rocketcomponent/PodSet.java
@@ -26,7 +26,7 @@ public class PodSet extends ComponentAssembly implements RingInstanceable {
 	protected double angleSeparation = Math.PI;
 	// angle to the first pod
 	protected double angleOffset_rad = 0;
-	 
+
 	protected RadiusMethod radiusMethod = RadiusMethod.RELATIVE;
 	protected double radiusOffset_m = 0;
 	
@@ -225,19 +225,22 @@ public class PodSet extends ComponentAssembly implements RingInstanceable {
 		}
 
 		mutex.verify();
-		if( this.radiusMethod.clampToZero() ) {
+
+		if (radius_m == this.radiusOffset_m) return;
+
+		if (this.radiusMethod.clampToZero()) {
 			this.radiusOffset_m = 0.0;
-		}else {
+		} else {
 			this.radiusOffset_m = radius_m;
 		}
 		fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
 	}
-	
+
 	@Override
 	public RadiusMethod getRadiusMethod() {
 		return this.radiusMethod;
 	}
-	
+
 	@Override
 	public void setRadiusMethod(RadiusMethod newMethod ) {
 		for (RocketComponent listener : configListeners) {
@@ -246,11 +249,13 @@ public class PodSet extends ComponentAssembly implements RingInstanceable {
 			}
 		}
 
+		if (newMethod == this.radiusMethod) return;
+
 		mutex.verify();
-		this.radiusMethod = newMethod;
-		fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
+		double radius = this.radiusMethod.getRadius(getParent(), this, this.radiusOffset_m);	// Radius from the parent's center
+		setRadius(newMethod, radius);
 	}
-	
+
 	@Override
 	public void setRadius(RadiusMethod requestMethod, double requestRadius ) {
 		for (RocketComponent listener : configListeners) {
@@ -260,16 +265,15 @@ public class PodSet extends ComponentAssembly implements RingInstanceable {
 		}
 
 		mutex.verify();
-		
-		RadiusMethod newMethod = requestMethod; 
+
 		double newRadius = requestRadius;
-		
+
 		if( this.radiusMethod.clampToZero() ) {
 			newRadius = 0.;
 		}
-		
-		this.radiusMethod = newMethod;
-		this.radiusOffset_m = newRadius;
+
+		this.radiusMethod = requestMethod;
+		this.radiusOffset_m =  this.radiusMethod.getAsOffset(getParent(), this, newRadius);
 		fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
 	}
 
diff --git a/core/src/net/sf/openrocket/rocketcomponent/position/RadiusMethod.java b/core/src/net/sf/openrocket/rocketcomponent/position/RadiusMethod.java
index b671953c6..5b466f0d8 100644
--- a/core/src/net/sf/openrocket/rocketcomponent/position/RadiusMethod.java
+++ b/core/src/net/sf/openrocket/rocketcomponent/position/RadiusMethod.java
@@ -16,6 +16,11 @@ public enum RadiusMethod implements DistanceMethod {
 		public double getRadius( final RocketComponent parentComponent, final RocketComponent thisComponent, final double requestedOffset ){
 			return 0.;
 		}
+
+		@Override
+		public double getAsOffset(final RocketComponent parentComponent, final RocketComponent thisComponent, double radius) {
+			return 0;
+		}
 	},
 	
 	FREE(Application.getTranslator().get("RocketComponent.Position.Method.Radius.FREE") ){
@@ -26,6 +31,11 @@ public enum RadiusMethod implements DistanceMethod {
 		public double getRadius( final RocketComponent parentComponent, final RocketComponent thisComponent, final double requestedOffset ){
 			return requestedOffset;
 		}
+
+		@Override
+		public double getAsOffset(final RocketComponent parentComponent, final RocketComponent thisComponent, double radius) {
+			return radius;
+		}
 	},
 	
 	RELATIVE ( Application.getTranslator().get("RocketComponent.Position.Method.Radius.RELATIVE") ){
@@ -43,6 +53,18 @@ public enum RadiusMethod implements DistanceMethod {
 			}
 			return radius;
 		}
+
+		@Override
+		public double getAsOffset(final RocketComponent parentComponent, final RocketComponent thisComponent, double radius) {
+			double offset = radius;
+			if (parentComponent instanceof BodyTube) {
+				offset -= ((BodyTube)parentComponent).getOuterRadius();
+			}
+			if (thisComponent instanceof RadiusPositionable) {
+				offset -= ((RadiusPositionable)thisComponent).getBoundingRadius();
+			}
+			return offset;
+		}
 	},
 
 	// Defines placement relative to the outside of the target component
@@ -60,10 +82,15 @@ public enum RadiusMethod implements DistanceMethod {
 			}
 			return radius;
 		}
+
+		@Override
+		public double getAsOffset(RocketComponent parentComponent, RocketComponent thisComponent, double radius) {
+			return 0;
+		}
 	};
 
 	public static final RadiusMethod[] choices(){
-		return new RadiusMethod[]{ RadiusMethod.FREE, RadiusMethod.RELATIVE }; 
+		return new RadiusMethod[]{ RadiusMethod.FREE, RadiusMethod.RELATIVE };
 	}
 	
 	public final String description;
@@ -82,5 +109,15 @@ public enum RadiusMethod implements DistanceMethod {
 	@Override
 	public boolean clampToZero() { return true; }
 	
-	public abstract double getRadius( final RocketComponent parentComponent, final RocketComponent thisComponent, final double requestedOffset );
+	public abstract double getRadius(final RocketComponent parentComponent, final RocketComponent thisComponent, final double requestedOffset );
+
+	/**
+	 * Returns the radius offset argument (starting from the center of its parent) as an offset value for this
+	 * RadiusMethod.
+	 * @param parentComponent parent of this component
+	 * @param thisComponent the component for which the offset is requested
+	 * @param radius the radius offset argument
+	 * @return the offset value of this RadiusMethod that yields the given radius
+	 */
+	public abstract double getAsOffset(final RocketComponent parentComponent, final RocketComponent thisComponent, final double radius);
 }
\ No newline at end of file
diff --git a/swing/src/net/sf/openrocket/gui/adaptors/DoubleModel.java b/swing/src/net/sf/openrocket/gui/adaptors/DoubleModel.java
index b9df44786..4e121af26 100644
--- a/swing/src/net/sf/openrocket/gui/adaptors/DoubleModel.java
+++ b/swing/src/net/sf/openrocket/gui/adaptors/DoubleModel.java
@@ -207,6 +207,19 @@ public class DoubleModel implements StateChangeListener, ChangeSource, Invalidat
 			
 			quad2 = quad1 = quad0 = 0; // Not used
 		}
+
+		public ValueSliderModel(double min, DoubleModel max) {
+			this.islinear = true;
+			linearPosition = 1.0;
+
+			this.min = new DoubleModel(min);
+			this.mid = max; // Never use exponential scale
+			this.max = max;
+
+			max.addChangeListener(this);
+
+			quad2 = quad1 = quad0 = 0; // Not used
+		}
 		
 		
 		
@@ -426,6 +439,10 @@ public class DoubleModel implements StateChangeListener, ChangeSource, Invalidat
 	public BoundedRangeModel getSliderModel(double min, double max) {
 		return new ValueSliderModel(min, max);
 	}
+
+	public BoundedRangeModel getSliderModel(double min, DoubleModel max) {
+		return new ValueSliderModel(min, max);
+	}
 	
 	public BoundedRangeModel getSliderModel(double min, double mid, double max) {
 		return new ValueSliderModel(min, mid, max);