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Just to save anyone from doing a search that might not have desirable results: The Polyflex belts are made by Gates, not 3M. I think the confusion came from the part number for the belt you mentioned, Chuck, as the number starts out with '3M'.
If you are planning to make pulleys for a Gates 3M cross sectiom belt note that the angle is 600 not 400 as most V belts are. http://www.gates.com/products/industrial/industrial-belts/light-duty-v-belts/polyflex-beltsDan
Chuck, Thanks for posting the video of your twin cylinder. Great sound. Takes me back to the D John Deere I ran for days on end plowing wheat stubble.Regards,Chuck Kuhn