Actually... heli-coil is pretty do-it-yourself-able. You just need to drill out and tap the existing hole, which is a breeze if it's aluminum, and not all that hard if it's iron/steel. Then the insert goes in with some thread-locker, and you're pretty much done.
All you need for tools are the proper sized bit and tap, which aren't expensive unless we're talking about a 1"+ hole. In fact, there are heli-coil kits that come with the bit, tap, locker and insert... and I would think a spark plug hole repair would be the most common repair as well.
__________________
Is you is, or is you ain't, my con-stit-u-ints?
|