Just gotta say it did its job, ART! I installed as directed, started drilling with a 2.5" hole saw, after about 20 seconds the edge of the hole saw somehow caught on the level, probably due to heat/expansion, and the level broke off immediately. The only saving grace was that it was bolted to the door so I could finish the side I started with and then finish the other side of the door. I also found that after drilling the 2.5" holes, it was extremely difficult to remove the pilot bit from theโฆ