Type 4 Two-arm Tangent Drive

Here's a front view of the upgraded Type 4 two-arm tangent drive.  Note the round knob on the end of the threaded rod used to manually operate the drive.  This is really a front view only for operation in the northern hemisphere.  South of the equator, the tripod head that holds the mount would be tilted in the opposite direction, and this would become the rear of the mount.