Dump valve came off in my hand. Need Fix. Video

Guess the valves are on the side and the cables go toward the rear making a 90* turn near the valve. I think I would ditch the cables and put a rod in it's place. To make the 90* transition, just use a triangle plate to redirect the motion.

If the bottom panel is removable as should be to reach the valve itself, would be easy to do the work.