How are going to put this into the water?
There is something missing here.Generally three hundred pound mushroom anchors require some reasonably heavy duty means by which they are hoisted onto a vessel. From there they must be hoisted off the vessel onto a selected area under many feet of water. Not to mention copious amounts of heavy chain, an anchor ball, pennents, and probably a pick up stick as well.While this could be a a do-it yourself project, my best judgement leads me to beleive that you should really have a professional mooring person install your 300 pound mushroom for you. I live in the New York metropolitan area too and am well aware of the exceptionally high cost of such a mooring installation. However, I really don't think you have much of a choice, unless you already have the equipment to do this yourself. And if you already have this equipment, then I am sure you could make a friend in the mooring business who may be able to provide you with a 300 pound mushroom anchor in exchange for some work on your part.