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My limited experience is that greaseless does not work on loose wheels. I think Harbor Freight has 4inch sewn wheels. Good luck!

OK, just so it's here, I did the math. 1750rpm, 6in wheel = 32,986in/minute. 3450rpm. 4in wheel = 43,354in/min. 6in wheel, 3450rpm, 65,030in/min. I have one 1750, 6in pads. Glen's solution is...

Acme Tool sells a Delta 8 inch variable speed grinder/buffer for around $85. Lowes has a 6 inch Delta for about the same price. I have the 6 inch, and it works very well. Greaseless compound is...