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I did the same thing with mine, drew a pencil line under the bottom of the closed lid, measured down to the top of the grate and put it in the center of the two, ran the plug in covered in never seize to prevent rust.
you don't wanna use smaller ones first, the larger ones tend to grab and spin in the chuck. Today I removed 3, 10-32 grade 8 bolts that were rusted in by center punching heating with a torch and drilling through, and re-tapping, saved the holes
didn't buy a lottery ticket, lightning don't strike twice