My dad was an apprentice fitter at Ferranti’s then an engineer at British Vita. If there’s a tool, nut, bolt, screw that’s not in his toolbox / garage, it’s yet to be invented.
He’s also got all his dad’s old tools. Fucking hundreds of washers, grommets that will only fit on British flanges that were manufactured before the Norman Conquest.
Every now and again he’ll threaten to “have a tidy “ and bin them. And every time he relents because “I just might need that one day”.
Feeler gauges for spark plugs!