I bought a set of Lyman hunting sights a little less than a year ago. I really love these sights because the front bead sight completely fills the rear sights circler notch. I shot very well with it until I noticed they kept moving. I tried all of the suggestions from you fellows on this forum without success. Now it was not your suggestions, rather operator failure.
Yesterday I got to looking at an empty percussion cap container. I created shims from the can using a pair of snips and a file. I carefully fitted the shims (tightly) inside the dovetails on the gun. Then used my punch to drive them in. I could finger start them about a quarter of the way in, but had to drive them in the rest of the way. The rear ight is definitely tight enough and I believe the front is as well, but it was easier to tap in, but not too easy. Anyways, If I need to, I will simply add a shim to the front dove tail. The trick is to make the shim to where you have to really push it in with your fingers.
I hope this can help anyone who has issues like I did.
Yesterday I got to looking at an empty percussion cap container. I created shims from the can using a pair of snips and a file. I carefully fitted the shims (tightly) inside the dovetails on the gun. Then used my punch to drive them in. I could finger start them about a quarter of the way in, but had to drive them in the rest of the way. The rear ight is definitely tight enough and I believe the front is as well, but it was easier to tap in, but not too easy. Anyways, If I need to, I will simply add a shim to the front dove tail. The trick is to make the shim to where you have to really push it in with your fingers.
I hope this can help anyone who has issues like I did.