Dave Sr. from SWISCO responded:
September 15, 2014
I'm not sure if you can do this, but what I have done in the past was to put a hole cut saw inside the 2-1/8" hole saw. It sounds confusing, but by installing the smaller hole cut saw into the smaller 2-1/8" hole saw (the one the matches to your existing hole) it will keep the hole saw plumb to the door. You may also want to talk to a locksmith or a carpenter to see what they suggest.
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