Ever had to grab hold of a dovetailed sight and do a little machining or filing on it ?
Had to drop everything and mill an appropriate dovetail into bar stock, fit the sight, so's to be able to get it in the mill vice ?

This gizmo here is probably on the display rack down at your local NAPA store,....it's for diddling the special clamps used on these high pressure fuel systems these days. Pehaps not as tight tolerance wise as we might like, but some judicious revamping sees it more than adequate to most tasks,....and the price is such that it beats hell out of scratch building one.

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Cheers, GTC

Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain