Spent an hour in workshop tonyt fitting the above chain, Always take my time and I could have cried when I was done, I started to tidy up and guess what heres a new x ring sitting on the floor below bike, IM always careful and double check everything but doubt set in, fcked of, Went of for the grinder to take of the new rivet link of, Just before I ground it I sat peed off looking at it thinking how the heck could I have managed to loss one, Believe it or not I studded it and double checked and the 4 rings were all in place, checked the old chain and yep all there, I then went round and checked every single link and all good, The bloody X ring must of been stuck to the chain when packaged and falling out when I rolled it out to fit, Thank god I didn't find out after setting in with grinder lol. Happy chap now lol