You may remember that i mentioned one of my spark plugs was cross threaded. I did manage to get the old one back in back it was really tight to do all the way up. Now....assuming that the thread is poobar, apart from a helicoil or whatever its called, and not wanting to take the head off, is it possible to tap the hole and try and recover the thread ? obviously the main problem is if any bits of metal fall down onto the piston right ? i have heard that if you are very careful and put grease on the tap it keeps bits from falling down ?
So what you reckon ? I was thinking of taking the bike out for a run (what

) and then doing a plug check. But i do know that that plug is old and was pretty black.
Ding ding seconds out. Round 2.
Pete