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a week late and a few dollars short, but here is a vid of a local guy demonstrating the nut welded to the broken bolt method. as he says, gotta use a metric cresent wrench. how is it coming though with extracting the broken bolts?

If you can find some fire wool/ceramic insulation and build an igloo around the work piece and use the map gas.

@3up https://www.yardstore.com/short-screw-extractor-screw-knocker-old-man-4 here is an old man. They did add an apex bit holder to the work end, but even then, a 1/4"dr. 1/4" or 3/8"dr socket adapter can be used. Air hammers/chisel guns will work, but don't have the control-ability for...

You are like me, blind in one eye, and cant see out the other. I too am not good at staying center all the way through. That is why about 15 yrs ago i switched to welding a washer to the bolt, then a nut and building the weld up inside the nut to add more contact surface area a d ability to...

You have an oxy/acet rig and a rosebud? That’ll get it red hot. But ya gotta watch out how much high heat you let transfer. Could cause a hidden internal failure in the head. Curiosity though. Why are gonna over drill and heli-coil all them? Would a bottom tap not work?

Iv seen heavily rusted items put into evaporust and using a cart style battery charger ( https://www.napaonline.com/en/p/NBC90156?impressionRank=2 ) and sacrificial piece of steel with the + terminal clipped to it, suspended in the solution and the - terminal clipped to the rusted work piece...