Here's Mine ! works via vacum to opperate clutch freespool so its fail safe. i.e, when no air is applied to unit, ring gear pin is locked. When applying air via switched 12 volt air valve solenoid, the unit vacums and releases the clutch pin from the ring gear, thus freespool is acheived. This unit replaces all of the original manual freespool mechanism and screws directly into the winch gearbox housing giving it a waterproof opperation.
The picture shows my Tdsc winch in the rear of my 90. Ive Rotated my gear box for personal preference.
This is my modified ARB Compressor with additional 12 volt solenoid.