We used a swivel on ours. Not one of those BS ones that looks like a bolt welded into a loop. Get a decent one like in the photo
, but not the cheapo ones. This is the weakest link. Not stainless! Ours was un-galvanized. We lubricated it with Anhydrous Woolfat ie Lanolin, pure, thick lanolin. It lasts about 6 months. We hung an anode attached to the swivel shackle with wire.
Our mooring was a 2m x 2m x 1m Concrete block weighing 9 tons, (7 underwater) There was a 1 1/4 bar cast into it. We passed a 3/4" chain through a 6' long re-enforced plastic pipe, to stop the chain hooking up on the corners of the block. This chain was about 50' and then the swivel anode setup, to a 1/2" chain of 20 ft that came over the bow roller and into the chain-claw, which was fixed to the bitts via 2 x 1 1/2" nylon bridle
I attached a 1/2" line to the last link and it was attached to a fishermans float.
To leave the mooring, I would loop the line and float out of the pulpit, and then dump the chain from the claw
. Sail away. On return, we would approach the float, hook it with a boat
hook, and pull it over the bow roller, take turns on the windlass
, and use the capstan drum to raise the chain up over the roller onto the deck
, attach the claw
, and stop engines.