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Is it one of those steel skinned doors or a wood one or ?.
If steel, do not overtighten the peep hole either, as the core is not solid there and you can dimple it in, by overtightening.
When I mentioned about 'corkscrewing' in my earlier post: What happens is that with a standard drill bit, because to the spacing of the spiral, you can actually create and oblong hole even when you think you are hoding the drill tight! It has to do with how the drill bit spirals it's way through the thin metal. The metal is thinner than the spiral cut in the drill. That is why. So by undersize driling it..if it gets oblong a little, the reaming bit will make it round again. The reaming bit I have is like 1/2 inch maximum diameter (maybe a little more) and comes to a cone tip at the end and is only about 1 inch long...and then the shaft of it, of course.
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