I havent either, but with the popularity of helix coils apparently many people do. And I always like being prepared. Furthermore, its not necessarily limited to spark plugs. You could use it in an array of places on an engine.
Not that they make one that small, but I did strip out the stud mounts in the blower for the TB and I had to re-tap them for 1/4-20, which given that its aluminum, thats what it should have been to start with not the friggin fine thread crap M6 x 1 that they used. I dont understand the mentality to use fine threads in something like aluminum.
