I managed to take advantage of a calm afternoon and with a 7/16" cobalt bit and a bottle of cutting fluid I drilled right through the piece of broken bolt in the hub. Took about 20 or 30 minutes drilling slow speed freehand and stopping occasionally to apply more fluid and give my arm / wrist a break. Bit stayed cool and still looks not too bad after I finally punched through so I think the cutting fluid helped. My only concern is that my freehand drilling was pretty much dead centre on the end where I started but went off centre a bit where I poked out the other end. This doesn t shock me, pretty good for old guy out shivering in the yard. There were nice uniform shavings coming off the cut.
Question- since I strayed a bit off the bolt axis, and close to (but not damaging) the threads where the exit hole is (it looks ok but it s definitely off centre) - assuming I get the remaining material red hot, is a fluted / straight extractor still the best option? I don t want it to bite into any thread material when I tap it in.
As always I appreciate everyone s replies and patience while I stumble through this
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