[bobdahaxor]

I saw the binding post, and yes it can bind. There is a rule of thumb though, each extension should go 1/2 of the previous. Like if you stationary bar is say 5 feet, then the second bar should extend only 2.5 to 3 feet. This will prevent binding. Our team used 8020 last year for our arm. It worked well, but you gotta follow that rule! Also use a CIM motor or Van door motor. Nothing else has enough torque to do the job in my experience. (Burnt up a geared down mabuchi. Poof!)