The Dawson online calculator worked perfectly. I measured the factory front sight at 0.10in. The Dawson calculator said it should be about .013-.014in. I opted for the .013in and it hits perfectly at 15 yards when I level the front and rear sight and put the top of the front sight where I want to hit, that's where it hits. And, now I have fiber optic in the front, for added bonus. It sticks out the front of the slide a tiny bit, but not further than the muzzle.
When removing the front sight I tried the aluminum Dawson tool...tore it up. I then used a brass punch...no luck. I had to use a steel punch from the right side to get out the sight. The original sight was held in with two small "punch points" at the front of the Dove base.
The Dawson went right in, and I didn't need to do any filing or anything like Dawson suggests. I wouldn't say it's loose, but it is not tight. I put blue loctite under and it seems to be staying in place. I think I will replace it with red loctite and it should stay.
Thought I would pass it along. Love the Dawson fiber optic sight.
Cody