Well i seem to have got away without any keyway damage one of the two keys is being a bugger coming out ,crank gear badly worn , new parts on order with Paddocks lots of rain slowing me down just found old waterproofs ,this engine has just clocked up 200,000 I've had it nearly nine years. I had woodruff key problems with my old rrc 200tdi then it chewed into the crank ,i welded keyway but never felt i could trust it on long journeys although it ran ok and with a rotting front door pillar caused by sunroof drains blocked it became a donor with about 170,000 miles thanks for the suggestion of loctite not sure if it was used when a friend did the belt last but the crank damper wouldn't have come off without special tool ,anyway ill try to get a bit more done today