In a thread that later went far afield (which is OK), @Adrian Wilson quickly identified the "mystery thing" I saw in this video. It was obviously a short-cut to using calipers to make identical copies of an item. After Adrian's post I was able to find a video of a shop-made Spindle Dancer Jig. Perhaps too much trouble for a casual duplication, but great for quickly making several multiples!!
Spindle Dancer Jig - Alternative to a Duplicating Lathe
www.lumberjocks.com
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