I have a brass drop-center flat set up with two wells. In one I have a roller with a rag glued to it, and in the other I have a block with some 320 wet-or-dry sandpaper on the bottom. I put a few drops of Wahl clipper oil on the roller, and the sand paper comes along behind and polishes. Best of all, it looks like a deep well flat car, complete with sprung six wheel trucks. If I decide to convert it to a scale freight car all I have to do is cover the two wells.
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