Mill Vise Parallel Keepers
thingiverse
A frequently used attachment for a milling machine helps secure parallels in position when working. The parallels you have should be the same width as your vise jaws to fit correctly. These can be bought or made with ease, but why not print them instead? Magnet hole is a press fit for a 3/8" dia., 1/8" thick neodymium magnet. Magnet polarity isn't essential.
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