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Old 03-01-2012, 03:37 PM   #1
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Drilling out a larger hole for a new lock...


I'm replacing the lock on my front door (double deadbolt because the door has beveled glass panels in it). The existing hole is around 1 7/8" and the new lock needs a 2 1/8" hole. Is there some neat trick for centering the larger hole saw on the existing hole since you don't have the benefit of anything for the pilot bit to drill into?

I figured someone here might know a way I might never think of...

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Old 03-01-2012, 03:46 PM   #2
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Drilling out a larger hole for a new lock...


You need to cut out a plug to fit the old hole. This would be 1-7/8 inch diameter, you may need to wrap a piece of paper around it to get it to fit tight in the hole. You use the plug to allow the pilot for the new hole to grab.

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Old 03-01-2012, 03:59 PM   #3
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Drilling out a larger hole for a new lock...


That means getting a new hole saw. ARGH I was just at the hardware store, lol.

Thanks Daniel, that sounds like a plan.
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Old 03-01-2012, 04:28 PM   #4
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Drilling out a larger hole for a new lock...


Take a piece of OSB, Plywood, 1 X whatever you have laying around and hold it so it's flush with the side of the door. Draw a circle where the old hole is.
Find the center of that hole and mark it.
Bore the scrape piece with the 2-1/8" hole saw. Now just screw it to the door making sure it's centered with the old hole. Now bore your 2-1/8 hole using the scrape pieces as your saw guide.
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Old 03-01-2012, 04:58 PM   #5
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Drilling out a larger hole for a new lock...


Thats a good idea Joe.... although I'd suggest clamps if you don't want screw holes in your door.
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Old 03-01-2012, 05:25 PM   #6
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Drilling out a larger hole for a new lock...


Quick grip clamps may woudl with out any damage. I forgot to add to put the screws where the knob trim would cover it up so no repairs would be needed.
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Old 03-01-2012, 05:42 PM   #7
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Drilling out a larger hole for a new lock...


Right on.

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