FYI there is another way to stablize the side to side moverment. You can drive pipe down beside the deck and lagbolt a next size dia U-strap around it. I used 1-1/2 galv electrical conduit from lowes with 2 inch straps. The deck slides up and down when water level falls or rises. The pipe sticking up about 3 ft from deck surface makes good rod holders for fishing too.
