Head is moving up/down with with the help of Rack & Pinion mechanism. Tilting a Head is accomplished with Worm Gear mechanism. This machine was used (and abused) as it can be seen on worm gear (on first picture). Luckily, I was able to rotate Worm gear for 180 degree, so part of worm gear where teeth was broken are not engaged any more. On third and fourth picture mechanism for moving head up/down and tilting Head can be seen, mounted on the machine.