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.