Eric A;3008566; said:Mines a resin one which is very flexible, so I folded it in half and squeezed it in thru the braces. I then piled gravel up on it to keep the bottom fitted up against the back glass, and put long pieces of drift wood propping the top up and put a bead of silicone. After 2 hours or so we got the driftwood pieces out as it was able to hold up on it's own, and waited for it to cure.
Thanks! Will give it a try.