I've love shank buttons, especially old vintage ones. Unfortunately I find them difficult to use in jewelry because they tend to dangle or hang the way they want rather than the way I want.
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Just fooling around tonight I figured out that they could be turned into hook clasps, here are the steps I took:
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I used 20 gauge annealed steel wire.
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Cut off a 4 inch piece and make a loop one inch from the end.
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Slip the doubled wire through the shank of your button, I like a nice snug fit but I think it's ok if it wiggles a little bit.
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Taking the short end , curl it up and around the shank with needle nose pliers, cut off any extra wire. This locks it in place and prevents the button from moving up or down.
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With the remaining wire make the hook clasp.
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Easy Peasy
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Angie