I was cleaning up my gear for the trip to OZ this year when I noticed that there was a ton of beach sand under my coil cover. Took me a while to get it all out.  There are depressions in the very center of the coil that are a great place for sand to pile up in. The thick part of the coil that goes from 12 noon to 6 0clock. I think before I hit the beach with it again i will put some clear RTV caulking on it and then put the coil cover on. I also have a couple of 1'x1'x 0.0625 " pi