The motor and potentiometer are directly connected to the epoch pcb. So I could try to open a servo, remove the control circuit and solder the potetiometer and motor directly to the epoch pcb.
I'm not a electronic wiz but I think this might actually work!
Btw, I was thinking of building a MAN 8x8, I love this machine!, I would paint it into some sort of truck trial version with lot's of sponsor decals