Sorry this is random and not any help at all, but I just noticed this guy has the same name as me haha, first person in trials i know that does, well done mate lol. On a more serious matter... Did you buy the bike second hand, which the model name suggests....03 and you have just got it. keep everything tight and buy a KMC chain, your problems will be gone. About the Clamp, is it your bikes fault you lost it lol, no i thought not Kieron