I picked up a barrel stub from a Krag rifle and want to remove the front sight base and put it on the "carbine" that I have. I have seen the front sight basses for sale on eBay before and it looked like they were sweat soldered in place. I got that stub red hot and tried to pluck the base off with a pair of pliers but no luck. After the stub cooled, I could see a fine line all the way around the base, like it might be a very tight fitting dovetail. Has anybody ever taken one of these things off? What is the secret? Thanks!