I'm with you, Gus.
When we cleaned out my dad's stuff I found a drawer full of half a dozen nice plumb bobs. The small 4 inch one with the leather belt pouch I keep with me at work and use frequently, sometimes in combination with a laser plumb (but that ran out of batteries the other day while I was up on the 4th floor away from the battery supply cabinet). One of the really nice brass ones I gave to my coworker Larry (my lantern picker friend). He is a tool hound and I thought he would appreciate it (even though he has the level app on his phone).
One time when I was working on in service submarines, SUPSHIPS (the Navy's construction watch dog "Supervisor of Ship Building") asked me to explain why I approved the stern plane operating rod hull and ballast tank packing clearances when they were at the high end limit at the top and zero at the bottom. This is like several 5 inch diameter inconel rods coupled together that reach all the way from the hydraulic operating cylinder inboard, thru the pressure hull and ballast tank bulkhead packing boxes, and into the mud tank where the dog bone and yoke are, about 20 feet, and is very tricky to get well aligned at new construction, let alone stay that way over the life cycle of the ship. They weren't used to seeing the numbers from each of these stations being so consistent with zero on the bottom. I explained, "Last time I checked, gravity was still working."

They bought it. Had to; nothing was out of spec.
