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weld whatever you want to the plug, let it cool completely, warm up the surrounding case with a torch, hit your plug/contraption with ice and give it a try.
The heat cycle from the welding may loosen it up, if not, expanding the case around the plug is surely going to help the situation
But...
Mmmmmm yummy hardware for it to chew on! LOL
yes, its always a good idea to take at least a quick look over things before you just jump in and flash it up, you never know whats been living in the engine bay over the years...