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What material should I make the sleeves from?

I remember reading an article about making brass drivers for HO locomotives, and how to go about insulating the rims. The article suggested machining the wheel and tire to a slip fit, heating the tire, and putting the wheel in the freezer. Before assmebling the mess, put the wheel inside a condom, and then trim the excess away after everything has reached room temperature.

I would suspect that a new, non-lubricated condom would be the best choice. ;)
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