Are you located in the US? I bought an output pot and knob for my quad from them a few years back, and had no problems with them. I called and waited a day or so for a response, but once on the phone they spent as much time as needed to make sure I was ordering everything I needed. I will be buying some sliders for my Formula soon (plus a bunch of parts for my 2:ninety..... not looking forwards to that bill or repair work)