I have a old Model 1894, serial #863128, that has the bead missing on the front site. The front site is a blade that is held by a pin in a mount which appears to be part of the barrel. After 90 years I doubt the pin will come out without putting up a real fight. Has anyone replaced a front sight bead, and if so what did you use for the replacement bead. Looks like a very small bearing would do the trick, but where the dickens would a man come up with something like that?