i looked at the first post of this and i was still wondering if you could use the two gears. or if i were to use the twisted belt method, could i use a regular chain. I wouldn't want to use a regular belt, it would probably break.
I'm not too certain about the gear method, unless it comes prebuilt with imput and output shafts.
If you're going to do it with the belts, you'll need a good bit of room, which you probably won't have.