Ken,
I went back to my block and tackle box and figured out the simple solution - I THINK !**88!
You will need 2 of these to be attached to the boom end of the Davits shackled to the universal head.
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You will need 2 of these to be hung upside down with the snap shackle RF6321 attached to
the universal head.
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You will need 2 of these attached to the RF51200 block by its universal head
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Method :-
1. With a length of good quality 1/4" braid, splice an eye-splice on the ring pull of each snap shackle's release pin.
2. With sufficient line rig the blocks with good quality 5/16th" (8mm) 24 plait double braid
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To detach the dinghy , drop the dinghy into the water - Retain a little tension, use a ABS boat hook to hold off the lower block, then pull on the snap shackle release pins - with the painter bring the dinghy around to the side boarding gate - get in, remove the lifting bridles. Ship the oars - add the passengers and off to the beach!
Richard
P.S. Overnight , thought ! OK that's good to release the dinghy from the lifting tackle, BUT OH! how do you reattach and get back on board !!! DUMB ! SO rethink = buy 4 RF6321 Snap shackles (2 at the top and 2 at the bottom of the block and tackle) splice on short lanyards to the top shackles - pull to release and lower into the dinghy with an attached line - bring dinghy round to the side gate . Reverse procedure to reattach dinghy to Davits. That better?