First thought was, make the silver shank soft. I'm used to copper, but apparently silver is slightly different, get it red hot and let it cool down,rather than quench it. However I found my torch is more suited to melting roof pitch than delicate work and it sort of melted the surface so it looked like tree bark! This tipped even me off that I was rather out of my depth. So I consulted with a local jeweler. This confirmed I was indeed in deep water. So off to Kernowcraft for supplies again.