Changed my fork oil today, the first time by me rather that someone else(?) while unscrewing the drain bolt on one it didn't feel right an lo behold when it was time to put it back I found that while there was reasonable purchase it wouldn't tighten down, so the thread is screwed, literally. On a CB400F it seems to be a tight spot with not too much space to work with, has anyone had this hole helicoiled or rethreaded?
