I didn't have much luck with the bumper bolts... Even before sandblasting the chassis at the start of the restoration, I tried welding on some nuts to the studs that remained after the bolt heads were broken off......hoping I could get the bolts out....I tried several times, but no luck. So at the time I cut off the last remains and used a centre punch to prepare for drilling out the studs.
Now two years later I was ready to drill out the bolts. Drilling went OK, but tapping new threads proved a bit more challenging. I broke the tap in the last hole.....now what? I tried heat, huge amounts of penetrating fluid, pliers and punches....but in the end I decided to try a tool I got from Ebay, A Tap extractor from Walton. It's basically a holder with 4 pins, that insert around the remains of the tap. With some patience....WD40 and even more patience, the broken tap came out. I was able to tap the last bit with new tap.
Alex
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Chevrolet C8 cab 11 FFW
BSA Folding Bicycle
Last edited by Alex van de Wetering; 05-01-17 at 23:12.
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