The switchook is two pairs of spst switches. The original 3 contacts that close in off hook and all three open in on hook. The replacement needs to have two of it’s contacts bridged. It is also missing the two binding posts needed to bridge one lead of the transmitter and receiver to the subset cord. I used the insulators and brass screw adapters from the original assembly, drilled the second 1/4” hole needed and provided the needed connectors. I guess if your doing serious restoration some modifications are needed. Completed looks and functions great