|
Done a few hundred of those. I doubt if a screwdriver will do you any good.
Best bet is to center punch the shaft of the screw and drill through it. You will need a good cobalt bit.
Also probably need a easy out. Some of them are straight and you can actually get the screw to go in a small amount, like a 1/4 turn. Then back it out a little and run it back in a little to break the bond.
Be real patient and you might save the threads, some penetrating oil will also help.
Used to have to do a lot of them on broken manifold studs on the old in line 6 Nissan Z car engines. If you can't get it out measure the diameter of the screw you got out and use a drill bit just slightly smaller than that diameter. Sometimes this will allow you to get the rest of the threads out of the part you don't want to damage.
If not then you will have to use a helicoil.
regards
Mech
|