JWinAZ
Active Member
My son and I drilled and tapped his 686 for a sight mount. I had previously done my 586, so I had the fixture. Done on my bench mill. The first two images show the front and end views of the fixture. The third image shows the revolver on the fixture ready to locate the first hole with a gage pin in the chuck. The last image shows the tapping setup. After the first hole is drilled and tapped, the mount is fastened to the top strap with the 6-48 screw. Then the second hole is located with the gage pin and drilled and tapped. We did not do the forward hole which is over the barrel. The stainless was as easy to cut as the carbon steel 586. I used a Reiff & Nestor (R&N) three flute tap, a very nice tap. If I do another one I'll add a clamp for the barrel and do away with the hex key and scale under the butt.