The sounder is a great idea and I'd have to say that aside from the compass, it's the most used instrument on the boat. The bracket is used to keep the rudder fully down when sailing. As a wood foiled rudder blade filled with foam, it likes to float back and up. When I do get into shallower water, I can release the bracket and allow the downhaul to keep the blade from popping all the way up. I wouldn't sail like this- with the blade canted back, the weather helm is multiplied. But when approaching an anchorage, I can keep the rudder draft the same as the keel. I like to anchor in about 3 feet of water when I can.
But the nylon pins work great too...and el cheapo is always nice!!!