I prefer the Harken micro blk to the Ronstan 20 or the no name blk that Murrays sells for trap set ups. I've had both deform in this application.
In attachmnet 3, are we looking at a chicken line diagram? Is there some low friction grommet that the lines pass thru entering the rear beam? Does the shock cord that retracts the retaining line terminate somewhere on the aft deck, pass thru the grommet to a blk secured inside the rear beam, and then exit the beam to an attachment to the retaining line? How is the interior blk secured? How is the shock cord attached to the retaining line? How is the retaining line attached to the trapeze dogbone?
Thanks so much, this is a great thread!

Dave