Modified NateTG's 60-tooth acme worm gear by adding center bore for 5mm shaft, M3 screw holes, trimming down the gear edges, converting original STL file inches to mm, and upscaling 1% so the print would better match a surplus Boston Gear worm of 32 DP, 0.438 PD, 0.500 OD from http://www.surplusshed.com/pages/item/m4598.html. Worm gear in motion: https://www.youtube.com/watch?v=v92hfs-y-m4