Sprayed with WD40 , Wurth ice , Kano , plus gas , and finally Liquid wrench . Not sure what worked , but as it was in for its MOT i said just loosen them off for me . He Said they came undone easily , hope so after that lot sprayed on . wd40 and wurth i don't think did much . Ive no cover to work and didnt fancy messing in this weather getting snapped studs out .
I can get on and fit the EGT gauge .