Yes, a strip of foam or (my favorite) a piece of (white neoprene) shelf liner. You know, the nubbly stuff sold at WalMart. It only costs about three bucks and you get enough to do a half dozen cradles. I saw a freshly waxed Discus roll over when a cross wind hit the vertical fin. The canopy was open to also catch the breeze and the result was a cracked canopy that only cost an arm and a leg to replace.