The current cable system just pulls the mallet downwards with the toe but it could probably be improved by using a round pulley rather than a lever. But figuring out the angle would take a bit of work and it would take more force to pull the mallet down than a longer lever. Perhaps just changing the angle of the lever would be the best solution.
Another problem is that the toe tends to slide forward when tapping the toe and I haven't figured out how to make it stationary.
1. The mallet could hit the guitar on the saddle as the sound is deeper and boomier there. Or one could add two mallets, on for the saddle and one where it currently is for a combination of different timbers (pun sort of).
Most folks don't like to screw up (pun) their beautiful wood surface on their prized guitar. And even though my guitar is a cheapie, it still seemed a shame to mess it up. So I simply adapted the mount to use the guitar strap button and a vinyl lock. Of course it could be screwed permanently onto the surface but I like the easy on, easy off functionality.
Not too much to it: depends on what materials one has around. Mostly one needs a frame to hold the "drum stick" and that turned out to be a wooden spatula for me. Drilled a hole in the spatula to mount it on the rear guitar strap peg and locked it on with a strip of vinyl.
Drum stick (chop stick) was epoxied into a fishing pole tube set inside another tube which was cable tied/expoxied to the spatula mount. A rubber band provides some tension for retracting the drum stick.
Wire connected to foot provides power to pull the drum stick.
Now I just need to develop a good sense of rhythm.