I've changed many a Spark Plug in lawn mowers with aluminum heads. Haven't had to have one heli-coiled yet. On the other hand, I knew a gentleman who sent his JD riding lawn mower to the dealer for servicing. They stripped the spark plug hole & then "Glued" the plug in. Needless to say the first time he tried to mow his yard it blew the plug out.
Around 40 years ago while hunting the Stirrup broke in the left lock of my J P Clabrough sidelock. I finished the hunt with a single shot. I, of course, didn't know just what was wrong then, only that the left barrel won't fire. When I got it home & took the lock off it was obvious what the problem was, so I made & fitted a new stirrup. I haven't had the lock off since & it has never failed to fire Yet.
Some of us are capable of doing a good bit of our own work. I have absolutely no idea what Joe's capabilities & doubt seriously that you do either.
