I used to be a repair tech for a company that makes postage meters and mail processing machines. Everything from a desktop stamping machine to big industrial sorters larger than some apartments I’ve lived in. I mainly worked on the big ones and the techs for the smaller machines liked to make fun of us for frequently defaulting to banging on stuff with hammers because we used the term “percussive maintenance” unironically. Also “four by four engineering,” used to describe employing a long wood 4x4 as a lever for lowering and raising the hundred and fifty pound gearbox from it’s inconveniently placed mounting on a certain model of inserter.