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For what its worth, my BLI 4-8-2 M1a Mountain has no spring. I agree that your photo shows a pocket for a flat spring. Were they thinking of using a spring in pre-production, and scrapped the idea? Is this truck used on another model that does use a spring? There is some extra engineering on the front truck of my M1a, also. It may be possible that they were thinking of something to help control the truck ..... it sure just hangs there loose and light. Jim
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