I had a new mooring laid around 6 months ago (see drawing and photo below), the bottom is hard sand (not mud) and the block just sits on the hard sand. This is causing a problem whereby the lighter D link chain finds its way underneath the concrete block. This shortens the whole scope of mooring by about 4-5 metres. It will sometimes free itself but I am wondering if I could deploy a mooring bouy somewhere along the mooring, either at junction between the two chains or between the lighter chain and poly rope? Hopefully this would lift the lighter chain off the bottom and prevent it from getting stuck under the block.
The other question is how do I stop the poly rope from chaffing on the bottom at the swivel, you can see in photo.
Thanks