The prototype version of my stop setter was made of wood, with magnetic latches to the case iron top. ?Over the past few years, a few people on FOG asked for the parts list and copied the design. ?So I¡¯ll post the details below in case anyone else wants to make a version with telescoping arm. ?I was after more accuracy than can be achieved using Brian¡¯s ¡°from slider edge¡± method. ?The inner edge on all of the sliding tables I¡¯ve owned is not a flat reference surface and thus varies by 1-2mm along it¡¯s length. ?I build to higher standards than that even on kitchen cabinets. ?¡°Close enough¡± is not in my vocabulary. ?To each their own.
This earlier implementation is based on a telescoping monopod by Manfroto - took me a while to zone in on something that was the right length, would collapse, be reasonably rigid, and off the shelf. ?I started with this:
The MagSwitch units are available from a lot of sources, but Grizzly is the cheapest for the smaller version I used. ?I bought the MagSwitch #95 which is just adequate. ?I would recommend using a pair of the MagSwitch 150 units which have stronger holding power.

David Best
https://www.instagram.com/davidpbest/
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I like David's solution for equalizing the parallel fences but I think it can be simplified by using a magnetic base to hold it to the cast iron table instead of the very accurate base that David fabricated. I also use this type of a magnet as a bump stop and it works very well.

Ariel