i know its been a long time since ive fixed this.. but thought id update anyway and if helps anyone else .happydays..
i had taken the back and and the drum off in one swoop, which i think was wrong way todo.. but i got new belt on with two people and some serious cuts to the hands when it spining the drum round to get on…. maybe somone else will top this up and tell me a proper way for next time.. sparky.