When I did my tank on my 1889 23WA, I found that the tank was free of the foam and the screws on 3 our of 4 places were free of the stringers. That made it easy to get the tank out, (other than having to cut 1/2" off of each side of the hole to get the wider tank out. I had to cut 3 feet off the rear of the tank to get it out of the large hole,it was 99 inches long and I probably would have had to remove the Honda outboard to take it straight out the back). I then used a putty knife which peeled the foam from the stringers easily. When the guy replaced the tank, he had them make lips on front and rear of the tank, then made a wood block to fit over the lip and screwed to the tank deck and then glassed them in place. We also foamed the tank w/ neoprene strips under the tank to drain water and foamed in the new tank. I think it will last the rest of my lifetime and boating days. Not that I am really that old so I do expect about 20 more years of service, but don't think I will be boat at 86 YOA.