Used v-belts before. They seemed to do the trick and had some built in slippage. Calculations for belt size between centres more forgiving than with tooth belt or chain. I did run a chain drive on the Blendo clone, but that had the benefit of a centrifugal clutch on the 4-stroke. There are some slipper pulleys as well , but probably simple is best for a do or die excursion. I presume you mean a 30 degree from horizontal disk or bar?. I'd expect a lot of tombstone and minatour clones to crop up. Very simple no nonense designs with large damage prospects if they keep working. Contactor for the ease again, you just turn on and forget and don't worry. Orange buckets too expensive. Black buckets only 99p forms wickes.