Back to back wheel gauge HO Hornby
thingiverse
I use Hornby back to back wheel gauges for my HO trains, but they should work with Lima as well. The recommended distance between the wheels in HO scale is indeed 14.4 millimeters from one inside edge to the other. Unfortunately, all of my kit carriages arrived with their wheels too close together. To find a more accurate gauge, I printed multiple versions at different scales: 98%, 100%, and 102%. Then, using calipers, I measured each one until I found the perfect fit for 14.4 millimeters. Now that I have my accurate gauge, I can use it to fix all of my misaligned kit carriages.
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