Yes, SkprJohn, noodles do compress under load and they can stay that way, especially if it is really hot weather
and if compressed for a prolonged period. They also perish chemically over time. I agree that it would be easier to replace them annually, so I will make the collar so it can be opened. That is an excellent suggestion.
I am thinking of using a heavy nylon zipper, but a nylon cord lacing with grommets may be better, cheaper and stronger. I will send along photos in a couple of weeks or so, once the gadget is installed. BTW a friend has suggested a mooring anchor
made from a large rubber tire, with its whole inner area filled with about 200 lbs of concete (cast into a garbage bag stuffed into the cavity before filling), and with a 3/4" rebar loop cast into it, for shackling to the chain. In a silted bottom, the flat circlar shape causes the anchor
to gradually sink into the ooze and once buried, the vacuum it forms with the bottom holds it very securely. This system is used in several yacht clubs in Massachussets and it seems to work
well for smaller vesels. The advantage is that the mooring
anchor can be rolled easily up inclined ramps, etc, to ease placement from a small boat
, without use of a crane. My mooring area is in a very well shelted cove with a sandy bottom in twelve feet of fresh water
A vessel as large as yours is would require a very much larger mooring, especially in the seas that you must experience there. There is a marina here which uses 1200 lb. concrete blocks as mooring anchors (in an current-swept tideway) and they moor vessels as large as 50' there, but charge 500 dollars a season (or 5 dollars a day) for using a mooring.