Tap Check Action

How does Wornum’s tape-check action work:

The tape is tied to a set of wires on the intermediate lever, which also holds the jack, the check head and the damper wire. When a key is depressed, the lever will push upwards, in return pulling down the jack’s escapement and pushing the hammer forwards to hit the strings. While the balance on the lever lies towards the front, the check head will follow and push forwards. This positions the hammer butt as close as possible to the strings. The wire of the tape will start stretching because of its length. It holds back the hammer to avoid it bouncing on the strings again. On the other hand, the movement of the damper wire will release the damper, allowing the strings to vibrate. As the damper is placed above the hammer, the term over-damper action is resulted.