My wife bought a Belgian guild gun which I will post later to see if anyone has any idea on the maker. Anyhow when it arrived the ivory bead was missing. I drilled the ivory out and there appears to be wood or cork under it. I presume that the collar for the bead is the circular portion left in the barrel. The outside diameter of the collar measures .160 . Does anyone know where I can get a replacement bead with that measurement? So far I ordered a bead from Brownells (threaded bead made of mastodon) which I thought I might be able to shape and fit into the existing collar. Any ideas would be greatly appreciated.