The auto parts stores don't carry them they will probably have a 14x1.25 as thats a spark plug thread. I went to an engine rebuilding shop and they had one. It wasn't a Heli Coil brand and I can't remember the brand but it was $60 bucks. You might need to order it off the internet, you will probably need to order a 9/16" with a 3/8" shank also. I bought a right angle drill at Harbor Freight for $40 bucks. I was able to find the bit at Tractor Supply Co. Be careful tapping the crank use lots of cutting oil and go slow, turn in a little then back out.