Extra-long bar-end shifter for the weak of hand - tapped the original lever for a pair of M3 screws and attached a toothbrush handle, before coating in Sugru:
It's like a bought one!
After several years of use, repaired a chip in the above caused by carelessly bashing it while carrying the trike through a doorway on its side without first shifting to a smaller ring. The colour doesn't quite match.
Makita battery to USB adaptor, with bodged 18V polyfused output, for mobile soldering
[1]. By bodging on the DC jack externally with Sugru, I was able to preserve the functionality of the USB outputs:
Protecting trailer box contents from being nobbled by the back of screws holding feet and reflectors in place:
Don't have a picture, but I used some to form a bumper for the underside of a fibreglass recumbent seat, to protect it from getting bashed by the parking brake lever as the steering flops about.
Filled in a gap in the rubber grip coating on the back of a mildly crash-damaged eTrex.
A couple of unsuccessful attempts to manufacture replacement rubber buttons for things with damaged rubber buttons.
Not had to do the cable strain relief bodge thing yet, but I put that down to owning a soldering iron, an assortment of heatshrink and no products of the Mega-Global Fruit Corporation of Cupertino, USAnia.
[1] The TS-100 is a clever open-source thermostatic soldering iron that runs on a 12-24V DC supply (so will happily run directly from most Toshiba-style 19V laptop power supplies). Don't buy one! They've since released the TS-80, which can be powered from a USB powerbank or wall-wart that supports the QC3.0 standard.