so. if i build a bracket allowing me to attach at one of the two bolts, i measured 10 lbs of force to go forward 3.5 inches over about 4 seconds and 15 lbs backward about 2.5 inches over about 2 seconds.
so i need to figure out what strength servo i can use to obtain this. i can put a lever on the shaft to get the throw i need, but that means a stronger servo will be needed at the short end of a lever.