I am puting together the rear ball diff. I have read on mytsn a couple articles on how to set it up. however I am a little confused. Once i put it together and get to the part where i screw the two pices together do i screw it in until its tight or just enough until i can't turn the pulley by holding both the shafts?

also does anyone sell just the ball bearings that go in the rear diff? I lost one and cant complete it until i have all 12.