Related Clues:

• Plane, e.g.
• Gizmo that holds things apart
• More level
• More smooth
• Closer to 50-50
• More balanced
• Flatter
• Plane, in a way
• Carpenter's gap-filler
• Relatively regular
• Plane in action
• It keeps things separated
• The tying run, e.g.
• One just filling in
• Plane at work