I found it quite hard to bend for the smaller stone, ended up using a much bigger stone and it worked out ok. I wondered if you have ever tried to do the method with the jumpring, but do it flat and bend and solder it into a tube. What I mean is use flat silver sheet and a length of wire and solder them together about 4mm from the top edge, then bend into tube shape and solder. I may give that a try as the chances of me being able to make a jumpring the right size to go into a tube is very unlikely.
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