If you PM me your mailing address, I will mail a copy of the Ace Champion exploded view drawings. They're 11x17 so not easy to scan. I think the AC v-drive is a great heavy duty v-drive, similar to the Casale C-500. I've had it in two Spectras and never any problems other than replacing the seals. Gears are tough to come by. Most gear shops can press on or off the gears.