Best knot to attach a painter to a mooring ball?
My boat lives on a mooring, and on days when club traffic is really slow, I can usually take a the club's little Sundancer skiff or rowboat out to the ball, hook the dinghy there, do my sailing, and pick up the dink on the way in. Saves me having to waste a bunch of time docking up.
A couple times, however, I've noticed the painter for the dinghy had worked itself alarmingly loose, and I feel that if I'd been out a couple more hours, I'd have found the thing on the shore instead of my ball.
My go-to knot for attaching a painter to a ball has been a round turn and two (or three or four) half hitches, but it seems that the action of wave and wake always works those half hitches out over time. Does anyone have a better knot for really locking that painter down so I can go for a sail without the anxiety of losing the club's boat?