I have been to the pub---again,
anyway when the pully on the dynamo didn't sit far enough on the taper, I just couldn't be arsed to open the pully up
, so i used a steam joint gasket that I thought would come in handy one day
{ don't throw it away you might need it} and put that behind the cork one to line things up , if I hadn't have found that it would have been layers of cornflake box ,like in old days