I almost lost my door. The holes were not vertical and the lock did not fit a 1 inch diameter hole. If your door is not a true square, the fixing will not fit and the plastic will sag. Ultimately, I'd rather measure accurately and drill by hand. Hole saws get so hot that it takes a while to drill a hole. I used a shovel to fix a 1" skewed hole. Best to invest in a good 2 1/8 hole saw and 1" putty knife and measure carefully. It literally made things difficult.
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