Boroscopes are great but they can sometimes give you more things to worry about. You're correct about the first mark, that's definitely tooling. The other two... mmmmm... needs more investigation....
Type: Posts; User: planenutz
Boroscopes are great but they can sometimes give you more things to worry about. You're correct about the first mark, that's definitely tooling. The other two... mmmmm... needs more investigation....