开云体育

I have a spark plug tool that I made and I just used an old spark plug and cleaned the ceramic out of the middle. I then tapped the inside and put a bolt in with the head cut off and then the end rounded over. I use it as a positive stop for determining TDC (along with a degree wheel). I would not consider it for breaking loose stuck crank bolts - too big of a chance of poking it right through a piston.