Originally Posted by MalcolmH

My LBS put crank arms from an electric bike on Keri's bike with the first schlumpf we got. She felt sorry for me not having one and she found a place selling more second hand schlumps - surplus from recumbents and mobility trikes - so I got one. It came with crank arms that would work. Really like them for going up hill - just drop itnto the lower range and there are low gears galore - can change a lot up steep hills adjusting the gears for minimum effort - at a correlating speed, but I'm happy with that!
Btw, I did communicate with ATS' agent in Taiwan and while responses weren't fast, they were thorough and their price for a new unit pretty reasonable. The day I got that response though I'd just ordered the second hand one. I'm tempted to get another one without the torque arm (which works on bifolds) for the not unlikely event that I get a folder where the rear triangle folds under the bike (like a Brompton, BF, Birdy etc) ...