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Just my 2 cents.
Removing rusted and or stuck bolts:
Clean any threads you can get to with a wire brush.
Use penetrating oil Kroil, Liquid wrench, Etc. Let it soak in.
Six point sockets or wrench.
Sometime turning the bolt out and back in helps.
Heat works in some locations.
Rounded head Vice-Grips. They even come in needle nose.
As for drill bits the only advantage to LH bits is sometimes just their use removes the bolt. Go slow when drilling and wear safety googles.
Get the hole for the extractor as close to centered as you can.
Ive had to drill to the threads and remove what was left of the bolt by pulling it out of the threads.
Good luck!
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