Reddit reviews Useful Machine Shop Tools to Make for Home Shop Machinists (Fox Chapel Publishing) 15 Simple, Useful Additions to Your Workshop Equipment, from a Micrometer Stand to a Self-Releasing Mandrel Handle
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It's the finger clamp project from Stan Bray's book.
https://www.amazon.com/Useful-Machine-Shop-Tools-Machinists/dp/1565238648
Mostly to spec (within my capabilities) except the slot is wider for drill press bolts.