Pin-in-Pin FTW! - Mul-T-Lock Classic(?)

*Key Control was the term I was struggling to recall

Correction: In the video I call out dkomando as the designer of the mortise cylinder holder I am using but that design is actually by fluxquanta and can be found here: https://www.thingiverse.com/thing:4791782

dkomando also has a cool design that can be found here: https://www.thingiverse.com/thing:3385722

Also on Odysee: https://odysee.com/@technosavage:a