This is a question for a rather odd purpose. I came across a working LEGO model of a Russian tank and I'm trying to model it using CAD software. It has a motorized system to elevate and lower the main cannon. This is where putting it into words might get weird: It uses a small motor which rotates perpendicularly to the eventual linear motion. The motor and the actual lift arm of the canon are lined up in the same plane, that is, they are centered. Whatever is transforming this rotational motion into linear motion has to fit into a space that is only several millimeters wide, and it's racking my brain since there's only one obstructed view of the mechanism. Does anyone have any ideas for what this could be? I'm assuming I can't post links, but on YouTube the name of the video is "Lego Motorized T-72M Main Battle Tank." It shows the canon elevation system a little after the 1:00 mark.