PS What size Allen key was said to use to check for a worn 520 chain??? Darn my poor memory.....
I think it was a 6mm on a new chain it won't go in, if it fits and will turn the chain is 'done'.
Least I think that was it - if I had taken my note book as advised I could have written it down though I'm sure the Capt will put me right next time I see him