Received yesterday and installed in less than 5 minutes this morning. (C'mon, 2 screws!) I made a template on paper in addition to measuring the distance between the two holes. The written instructions in the garage door opener setup booklet (old liftmaster over 5 years old) did NOT work. HOWEVER there are slightly different instructions on the cover of the device itself and it worked perfectly the first time. Just for comparison: I am a woman over 70 years old.
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