There are two types of wheel cups that work with SG wheels: in years past, full size cups were made that had replaceable pins for lionel vs AF vs Ives screw sizes. Another variation just worked the wheel centers, tools about 1 inch diameter or so, with the series of pins and quartering marks. Hobby horse made the latter I believe. I have one set of each type and made inserts for the full size set so that the smaller wheels (small AF) would center.
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