OT what is it Lee Valley version

Hi all ;
Lee Valley 's e-newsletter usually contains a " What Is It ? " .. often contributed by D. S. Orr. .... some are almost as intriquing as the ones posted here . :-)
I never saw or heard of these items before ... http://www.leevalley.com/en/newsletters/Woodworking/8/1/whatisit.htm
John T.
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