What does this "socket" fit ?

[Tim Clarke]

Ya, we had some issues with the Triton plugs in our fleet. The method I used was to run the truck into the shop on Friday afternoon, and while still warm, Crack each plug about 1/4 turn and pour a teaspoon or so of Kroil in the sparkplug bore. Monday, they'd come right out.

[nickel-city-fab]

Oh yeah, I remember now. Thanks for helping me relive a nightmare.

Whoops, didn't mean to.... those manifold bolts were right around the time I learned to really use a torch. Cast iron doesn't cut, you can "wash" the bolts right out of the holes in the heads and then just chase em with a tap after it all cools off. Main thing is not to light the rest of the greasy lump on fire.

[PStechPaul]

A really effective security bolt would be to drill out the socket of a hardened SHCS using a carbide drill. Only way to get it out would be to drill the head off or weld a screw onto the head.

[ikdor]

A better security bolt would be to stick a socket head cap screw into a recess and press a ceramic ball into the hole.