What do you do to recut the seat/sealing surface after welding, or do you manage to keep it ok? As Mike knows, and the reason I have been researching inserts, is I have an 038avs that a previous owner helicoiled.... Badly. The insert is firm in place but was too long/not deep enough and when I got the saw it had about half a turn protruding and stopping the plug sealing. I ground off the protruding coil and found the sealing surface beneath mangled over half of the way around. I've managed to get a seal using a 1.5mm copper sealing washer on the plug, and a smear of gasket cement, but still thinking about better solutions.