And that happens to all of us one time or the other. So I am taking an OHC PS50 engine apart and the oil drain plug is so tight that I decide to "shock" it with one of those apply-hammer-and-the-bit-twists-slightly-to-the-left-or-right tool. We call it a slagschroevendraaier. A perfect word for a non-native to say as a swear word. It sounds scary but it means nothing bad.
ANYWAY. I will weld this once the engine is ready to be assembled again. Dangit.