One of the four bolts holding on my heater box to the firewall had its head broken off by the PO before I got the car so when I removed it yesterday I wanted to extract the remnants of that bolt from the firewall without harming the (fine) threads.
Dutifully following the instructions that came with the screw/bolt extractor I bought, I drilled a 1/8" hole into the bolt and then (reverse) threaded the extractor into it until it “caught”. Then I tried to turn the extractor to work its magic and it promptly broke off right at the entry point to the bolt.
So now I not only have the remnants of that bolt stuck in the firewall but I also have a hardened steel extractor shaft stuck in there too! When I tried to again drill a 1/8" hole all I got was heat and smoke… really need some advice on this one!
Anyone have experience with the correct method for removal?