Re: the lead toilet bend: looking "OK" means nothing, those things corrode from the inside out. On several occasions, I've started leaks on fine-looking
lead bends just by lightly running my fingers over them, which evidently broke through the tissue-thin spots. If the bend was installed in 1956, it's long
overdue for replacement.
The lead in the space between hub and fitting is what's drilled out. Use caution: it's easy to jam the bit in there, perhaps snapping it off.