Oh shaft size is .866 need to do some more looking. Totally correct in that you get what you pay for. The caster is adjusted by screwing in or out the bushers do yes it's a dismantle job but I found it only took a couple of goes to get them even. The real issue is lining up the bushes on the mount when one is at a slight angle . The bolt system for camber adjustment is a bit of a pain but once it's set I guess it does not need changing. Range of settings is not bad. The real problem is the arms are flat where as the OEM are curved to allow more clearance.. my guess is they designed them not taking into account people lowering their suspension. Anybody got any ideas on how much the suspension can move up from it's nutral position seems even with stock arms once it's lowered by about an inch there is only about 1.5 to 2 inches above the arm.