ha i guess that is a good reason!
mcmaster #6175K811 - i have tried a couple different varieties and this is the easiest to work with and seems to hold up pretty good.
1 foot not quite enough for a pair of clutches, you need 2 feet with a little extra in case you mess up.
then you gotta grind it down to size on a belt sander or lathe (preferred) the better round you get it, the better the clutch will work and the longer it will last. If there are high spots or low spots it will vibrate and slip