I just wanted to say that I tried flooding it with silver solder and it worked really well just one dot has gaps now although I was concerned that some of the dots had disappeared forever at one point! I'm working on using this technique again now and I've ordered a set of broachers and drill bits the size below my wire. Also ordered an Archimedes hand drill as below 0.9 I found the bow drill likely to snap the drill bit.
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