Use a normal rotation carbide bit and run them through the other side (Or if it doesn’t work you have a hole for an extractor). It doesn’t normally take much effort to turn them, occasionally I could do it with my fingers.
I got broken bolts out of pockets by welding a nub onto the flush surface and turning them out. We didn’t use anti seize and it was never hard to remove the broken off portion.
Every normal pocket I’ve seen used 5/8-18 threads.
From what I've seen torque specs can be wet or dry, and the lube specified can be a myriad of things from anti seize to 30 weight. Sometimes it's lubed, torque to 90lb/ft plus a certain number of flats (60* on a hex bolt).
On critical fasteners like connecting rods where both ends of the...
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