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Dreaming of a compact camera after lugging a Nikon D810 across Europe, the Fuji X100F was love at first sight — but there was a catch: severe near-sightedness. This post covers how to hack a Nikon DK-17C correction eyepiece onto the X100F viewfinder and make it work for -5 diopter vision.

Car trouble on the side of the road sparked an unexpected DIY project: building a homemade fuel injector tester with Arduino Nano and a MOSFET for under €10. This post walks through how fuel injectors work and how to diagnose them without removing them from the engine.