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The smallest wheels I have found that fit on my Baldor are 3", very handy for very hollow blades. Even they can be too big sometimes, then I use my Dremel.

I use painter's tarp, all the junk folds nicely in and is easy to dispose of.

This is the one I use and it works super
Baldor 1/4HP 1800 RPM Buffer 115 VAC/60Hz - Buffing Machines - Buffing/Polishing - Caswell Inc

You may need all the wheel sizes 3",4",6", rarely 8" for...