Want to be fresh at the end of a long flight? Experimental-only autopilots beat their certified counterparts. They're usually less expensive, more capable and far more user-serviceable (if you know what you're doing). By Stein Bruch.
Having problems drilling a precise hole in a tube? Ishmael Fuentes has the perfect-and inexpensive-solution with this nifty, easy-to-make V-block drill jig.