installing Defiant deadbolt

I am installing a new Defiant deadbolt (and I know this is not a good lock in terms of quality but it doesn't really matter too much for this door). The problem is that the instructions say to drill a 1 1/2 inch hole for the deadbolt but I only have a 2 1/8 inch hole saw. I know that older locks used to be in 1 1/2 inch holes and newer ones use 2 1/8 inch holes, so this lock is probably designed to fit in as a replacement for an old lock, but what I'm wondering is can I put this deadbolt into a 2 1/8 inch hole? I don't want to buy a new saw. It's not worth the price I paid for the lock! Will this lock just float around in a hole that's too big or when I tighten up the screws will that hold it in place? Thanks in advance! Most deadbolts sold nowadays will adapt to a 2-1/8 crossbore hole, but check the diameter of the outside collar inside thumbturn plate just to make sure. When installing, (usually with the bolt extended to ensure correct timing), center the lock body over the holes, while tightening the screws...snug the screws up fairly tight. If the lock won't completely cover the holes, (this was very common with older deadbolts) your local smithy can sell you for cheap, a pair of so-called Goof Rings, or adaptor rings that will extend the lock's diameter. Take the lock with you to make sure the rings will fit onto it properly. Thank you, rstripe. The outstide collar will cover the 2 1/8 in hole. The important thing you've pointed out is to make sure it's centered properly when tightening up the screws and to have the bolt extended. Good. I'll do that. Thanks again.

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