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Jay, I made up a plunger/piston head with what I was thinking might work for groove sizing that allowed for some sand in them, and still seal well. I'm thinking that I'll move them to the land side instead, so no sand will sit in the grooves. http://www.flickr.com/photos/12242379@N05/3205257634/ The grass is greener on the other side of the acrylic. http://www.flickr.com/photos/12242379@N05/3204411299/sizes/o/ Szybowski |