For those that may wonder what the heavy panama rollers are set in the aft deck bulwark starboard aft is for, it is the lead for a 100t salvage 6 sheave block and tackle set. the forward block shakled onto the accomodation bulwark to starboard of the towing winch house, the tackle led off round the fixed roller set at 45deg by the panama lead and connected onto a towing wire from the towing winch. To my knowledge it was never used in anger.