[bulletbob]

I regularly fished the 20 rockpile for blackfish decades ago.. Guys would throw a hunk of metal or wood into the jumbled rocks, with a rope attached, it would wedge in the rocks, and then you simply tied up and fished.. when done, you left the rope for others to use.. We usually had a few existing ropes that we could grab and tie up to.. Low tech but it worked.
Back then, in the 80's we never fished there with other boats around, maybe one and then ,only on a rare occasion.. Different world today, with 5 rigs vying for position on that little rockpile, and for porgies no less. bob