diff --git a/swing/src/net/sf/openrocket/gui/configdialog/RailButtonConfig.java b/swing/src/net/sf/openrocket/gui/configdialog/RailButtonConfig.java
index 1c6d3c53e..d16120e0d 100644
--- a/swing/src/net/sf/openrocket/gui/configdialog/RailButtonConfig.java
+++ b/swing/src/net/sf/openrocket/gui/configdialog/RailButtonConfig.java
@@ -132,7 +132,7 @@ public class RailButtonConfig extends RocketComponentConfig {
 			if (component.getParent() != null && component.getParent().getLength() > 0) {
 				maxSeparationDistance = component.getParent().getLength();
 			}
-			panel.add(new BasicSlider(separationModel.getSliderModel(0, 0.001, maxSeparationDistance)), "w 100lp, wrap para");
+			panel.add(new BasicSlider(separationModel.getSliderModel(-maxSeparationDistance, maxSeparationDistance)), "w 100lp, wrap para");
 		}