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I am kind of proud of this so I had to share it. A few weeks ago I got a 'Wild Hair' to make my own 3-dots. I was going to change the sights on my 1991-A1 but I like the originals and they are dead on. I put it in the vise and and carefully measured and used my dental drill with a 'tree' burr to start and then a 3/32" ball to create the depressions. I lightly sanded the sights, touched up with cold blue and filled the depressions with white-out. You could not tell it is not factory. The dental drill is a great gunsmithing tool - I use it a lot.