I'm hoping I don't have to do this, but my PX-10 continues to give me problems with the bottom bracket. The spindle and cups look good. I've repacked and replaced the bearings,but it still "pops" when I'm climbing hard and the left crank gets to about 10 o'clock. I'm anticipating needing to replace the bottom bracket. Are there any tricks to getting the fixed cup off. It hasn't ever been removed in 30 yrs.. Thanks for any help,Frogge.