Back in the day, my dad and uncle who are rabid ham radio dudes used to travel and stay at my place to attend a ham radio show and always made it to Boeing surplus for all kinds of stuff. One year they both bought hundreds of large vacuum variable capacitors and inductors. By the pound. They both made many thousands of dollars re-selling them within the ham radio community. I always wondered what Boeing even used these for unless they were from WWII leftover stock or something. I went there a few times and there were deals to be had but I didn't really need a tow tug or 727 cockpit on a trailer.....tools, drill bits, safety wire pliers, rivets for cents a pound. Shame they are gone now.