I am doing something similar and was going to use Micro bearings from Star Sound but they are temporarily unavailable. I used Atabits, which are small steel shot which are imported by May Audio. Their sourcing was changing from Atacama to Target so they too may be hard to find. I would like to say that I had conducted long listening tests of every available material but the truth is I wasn't happy with lead, sand, or kitty litter so was looking for something else. Happy so far but not had enough time for definite conclusions. The shipping on either of these will be fairly high as they are quite heavy.
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