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Hi, Been checking over a Proto 0-8-0 switcher and measured the width of each pair of drivers at the rim. 1st axle 0.4415 2nd 0.440 3rd 0.4388 4th 0.435 axle with TTHow much variation in width should there be between pairs? I'm inclined to try and widen the rearmost axle to close to the 1st pair's. How have you approached similar issues?
A much more important measurement would be the back-to-back distance between the wheels, which according to the NMRA spec, here:https://www.nmra.org/sites/default/files/standards/sandrp/pdf/S-4.3%202010.02.24.pdfshould be 0.294" in N Scale.The nice thing about using the NMRA gauge plate is that it also implicitly checks for flange depth and flange thickness. And of course, it's just drop-in easy to use.