I stripped out one of the threads for the tranny cover and one for a cylender stud. They are both the same size thread but i cannot find helicoild for them. I need size M8 X 1.0. Autozone has these "OEM" kits for $20something, but they have the M8X1.25, my local hardware stores lack a helicoil stock. I found several kits online, but everything was upwards of $50.
I tried making my own inserts by taking a bolt and drilling out the middle so i could tap out the stripped threads to the size of the bolt and the center of the new insert to the size of the bolt, but i broke 3 drill bits and wasted 2 hrs. The only thing it achieved was making a mess.