Great idea!

I'll take some pictures of the drivetrain this weekend and post so you all have a better idea of how this thing is built.

BTW - We shot at the World Championships of Punkin Chunkin last weekend and won with a shot 1776' (a world record for a human powered centrifugal machine). Looking to glean as much as I can from everybody here and improve for next year. So thank you all for your input!