Frankly, the list of useless articles is far longer than the useful ones, but I keep subscribing anyway, in hopes they get back to FINE scale modeling...
It's not my favorite article, but it's certainly the one I've gotten the most use out of... Greg Kolasa's September 1991 article, "Detailing a 1966 Shelby GT350H"... While I couldn't care less about car models, two things stuck with me...
In it, he detailed how he built a jig for making seatbelt hardware for the car, and I've used a variation of it for the last 20 years to make my own aircraft seat-harness hardware jigs...
He also detailed how he cast super-detailed parts using a container that used centrifugal force to force the resin into RTV molds' tiniest nooks & crannies... Basically, spinning it around on a string like a bolo...