The front winch is a self recovery winch Werner f64 self spooling. If you look at the picture on the right side of the winch the mushroom cap can be removed and under there will be a 27mm bolt when the winch needs rewinding turn this bolt to the right this will slacken the cable enough to free spool the drum. can I ask why you are having to snatch block in the picture ? The better winch for your purposes would be a f56 I have one that I fitted with radio remote control they have winch in and out.
Moose