Well, PFR, I have a pair of black brogue shoes that I wear with suits which I've had for 35 years. Just having their second re-sole now. Cheaneys, if I recall, though the tooled and punched name on the inside has long ago worn away.

I recently mended a wooden pepper mill that I've had for 40 years. The bar across the bottom holding the grinding gear in had just worn through with use....so I filed down a spare aluminium guy rope tightener from one of my tents and screwed it on in its place. Works (and looks, if anyone ever bothers to turn it upside down to inspect) fine.

My oldest camping stove is an original "Bluet" which my uncle gave me second hand when I was 10. Must be at least 60 years old by now. I've replaced the rubber canister seal and the control knob and it's still fine.

I also "make do and mend" with more modern stuff, such as mobile phones, computer mice, etc. I hate throwing stuff away and buying new if it can be fixed! I have one older Nokia where I've replaced the touch screen, the end cap, the HDMI connector and the camera flash, at different times, all with bits bought for a quid or two from eBay.