You could use something like a small bolt to space out calipers to measure the bead hook thickness. Anything of known size would do.
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These are about a quid on eBay
"dental thickness gauge" or something along those lines
What is this? A polo mallet for ants?
@Danners started
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You could use something like a small bolt to space out calipers to measure the bead hook thickness. Anything of known size would do.
1 Attachment