My father and grandfather gave me a ton of old woodworking magazines. I’ve been browsing through them, trying to find useful projects, and stumbled across this screw advance box joint jig. I built it out of hard maple following the plans closely. The screw is a piece of 3/8” all thread from a big box store. The jig works well, although there is a ton of cranking involved. In one of the pictures you can see I wrote the number of turns per desired distance. For example, if you want 1/2” box joint fingers, you have to turn the handle 16 times (8 for 1/2”, 8 more to skip the next finger) for each cut. Times that by four sides and x number of fingers each side, that’s a lot of cranking. The face on the front is some replaceable plywood backing.