Sir, The lack of education amongst the lower orders is lamentable. I have decided to permit the more promising servants to improve themselves whilst attending to their chores.
Printed the “inverted” design by u/OldDepth1294 and have done some sanding of it already to smooth it out a bit. Pic taken while locked in a ringless cage I’ve printed previously that is locked to my PA (the locking pin on the lock is also 3d print