The shim stock connection has shown no sign of fatigue and it is easily replaceable. All aluminum construction, nice ''feel''. This is my first attempt. It uses a rocker-plate mechanism. There is some lost motion, and the ''feel'' is not crisp.
Construction is all aluminum, with some plated brass fittings.
This is my second attempt. It works well, but the ''feel'' is not yet there. It uses a transverse ''rocker'' mechanism. A single tension spring at the center of the pivot unit provides the restoring force. Two finger pieces are provided to give the unit a better ''feel''.