everything was going well. new bars on and nearly half the weight of the previous one. left pedal off, left crank off. no problems. right pedal, ooh, it's a bit tight. big effort, hand slips, thumb nail chain ring interface. do a little sweary dance. feel a little bit sick. now have a small hole in the middle of the nail that wont stop bleeding. eventually extracted cranks and new ones fitted. no longer able to see the beauty in the polished aluminium. ring-spider is 1/8" ......going to town now to buy a new chain.