I just got a Supreme from a board member and I love it. I also ordered the clamp and longer shaft. I can't figure how to take the head of and remove the old shaft and put the new one on. There is an allen screw looking hole but none of the allen wrenches they sent fit. It must be bigger than the 3/32 but smaller than the next one up I have. At Dyna king the lady told me it was a 3/32. I can vouch it is not. Am I trying the wrong place? Right near the top on the side. ANy help, diagrams prayers for my temper are appreciated.