"The 3 cone point screws lock the PTO between the internal snap ring and the back side of the bearing proper." Yes I knew that, my thoughts were that because I only had two of the three cone point screws contacting the backside of the bearing, the whole PTO was likely to wobble when the brake was applied and the thrust button therefore did not depress the springs. I maybe be totally confused about the effect on the mechanism when the PTO is not snugged firmly against the bearing but that is my layman's deduction. Am I wrong? Thanks!