Keybear, sorry to hear of the trouble.
I'll relate my experience. I had a Ruger Vaquero in stainless. Many years ago the front sight fell off. This was a fixed blade sight. I put it in the safe and didn't deal with it for years. I have my own woodworking shop and do a bit of metalwork as well. I was going to attempt to silver solder myself, but never got up the nerve. I was worried about too much heat to the barrel, discoloring, etc..
I finally contacted Ruger and they offered to send a shipping label for me. I sent the revolver back and got a call from them. The only option available was for them to completely replace the revolver. I had figured on them installing the sight. This threw me for a loop. The Vaquero was the first handgun I ever bought. It was also an original Vaquero and would be replaced with a New Vaquero. They said the old one would have to be destroyed. It took me weeks to make the decision. I finally ended up with the new one and am very happy.
My point is, hopefully you can get the sight reinstalled properly, but for some reason, even the manufacturer didn't think that was the right fix.