Box Jack

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What is it? A small "box jack" that allows height adjustment via a knob from the side while loaded with weight. Has an adjustment range of about 40mm. Tested up to 13kg, but can probably go higher. About 10 rotations per mm for a standard bolt (explained below). Background/reason it exists I needed a small jack where I could use three to level a platform, each making contact with the platform. A lab jack came close to what I needed, but I found the size of the platform at the top of that design unsuitable for my needs, and I was unable to find any jacks of other designs that were small enough. I find it useful for leveling printer platforms, fish tanks, other things of that nature. Assembly 0. You'll need a 5/16in x 2in fully threaded bolt, 5/16in hex nut, and 5/16in washer from the hardware store. There's a channel in the support post of the housing: that is for a rotation-lock pin, which you will have to make. Drill a center hole in the bolt, 2mm from the end of the threads (not on the head end), make the hole big enough for the diameter of a 12mm length of coat-hanger wire to slide through. Drill carefully, and don't mess up the threads, you'll need the nut to still be able to screw on. Use the 12mm coat-hanger wire for the pin. 1. Push the ends of the worm-drive (the cylindrical one) into the circular recesses near the top of the housing, with the square hole in the drive facing the circular hole in the housing wall (that's where the knob goes through). It's a tight fit…