To ship the SU-100 to it's new owner, I needed to remove the barrel. It's a bit involved, so I wanted to take some photos with instructions, but I figured this would be a good opportunity to show you guys how I did it if you're interested in traverse or elevation with another project.

The servos are Futabu with the boards and stops removed, so they are in essence and small motor/gearbox combo.

The recoil unit itself is connected to the mantlet gimbal and the elevation servo drives the unit. The entire assemble shifts side to side for traverse.

The first photo is one of the micro-switches. This one is an elevation stop (it may need to be adjusted after barrel installation, the others won't be affected at all). The switch stops travel by cutting power when depressed (the metal arm is fully adjustable by bending, it contacts a small button with an audible click), but allows travel in the opposite direction until it hits the other switch. This photo show where it hits the servo arm to limit travel, fully depressed.