Jez that is a PIA. talk about stuff going south. You have my empathy!
Please tell me you got lucky with the cam cover bolt that snapped....it left enough to get on w/a vise grip after the cover is off???
I hate it when that kind of stuff happens, it destroys the whole "good mood" thing that ya get from doing something on the beast.
Good luck with the broken bolt Hans!

Tom
fwiw, I look at my stained covers and think "what if I just pull'em & paint'em"....then I remember all the posts I've seen like this and think "live with it"...