I tried updating that second pic.
I think the advantage of using dumbells that are interchangeable is that you can move along more quickly and perhaps make the the whole jig a lot stiffer which may make it more accurate. But of course you have to have specified depths of binding which for the most part I almost always do but my purfling schemes differ a lot so I like the fine adjustments.
Neil you will want some kind of doughnut though for sure.
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