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Hmmm...MGs aren't known for their reliability and ease of maintenance.
I always thought the mallet was for beating the car into submission when it failed to start.
30+ years ago I stopped in a shop in Santa Clara, CA that specialized in restoring and selling classic MGs. They had a bumper sticker that I should have bought and put on the 1976 MG Midget I owned for a year - "I'll have you know that the parts falling off this car are of the highest British quality!"
To the original drift of this thread, my main socket sets are S-K. The 1/4 inch set was received as a graduation gift from high school, in 1970. No parts are missing, nor have any broken and been replaced. A few years later I bought a 3/8 inch set. Same story - no parts missing and none have broken. Now, my metric sockets that I use with the 3/8 inch set are Craftsman. From the late 1970s. I split one in half in the late 1970s. Sears replaced it without question. No problems since. My 1/2 inch socket set is Husky from Home Depot. This includes a torque wrench. Not heavily used and they are holding up great. SAE and metric sockets. Probably bought them around 1999 or 2000 as they were for working on my Jeep (and I bought it in 1999).
Screwdrivers are a widely varied set. A bunch of them were from a set that I bought decades ago. Not the highest price, but they seem to be holding up. I have a kit of screw drivers, hollow ground for the flat blades, that I use solely for working on firearms. Nothing else. Bought them back in the late 1970s when I got involved in black powder shooting.
Everything else is varied, both in source and age. They hold up for my uses, and if they don't, they get replaced. Ace, Home Depot, wherever I happen to be at the time. Power tools are the same - some old, some not so old. Heck, I've got an orbital sander whose actual age is unknown. I remember using it in junior high, and it wasn't new then. Or does my brother have it now? Just got it out of the garage as Mom was moving from her condo and I don't remember which of us took it. I know it still works, in any case. And the vice on my work bench? I have no idea how old that thing is. Dad got it, probably from his brother's estate, in the early 1960s. Big, heavy and works like a champ. Some tools just don't wear out.
Sure hope I don't need anything new anytime soon. Now, if I could just find my 3 pound hammer...