1977 Cat22 transom issue. Prior owner had two U-bolts mounted high on each corner of the transom. The one on the starboard side is fine. The one on the port side was loose and the fiberglass indented. After removing the U-bolt, I could not see any part of the 1/4” wooden transom core inside the mounting holes. I used a 12” plastic cable tie to see how much of the wood was gone. It went in all the way to the bottom and half way to the center of the transom. I estimate that 15% of the transom on the port side is void of any wood core. Can I fill this void with a resin or foam? Luckily, there is good wood in the motor mount holes. The inner and outer transom skins are 1/4” thick and show no damage. I would appreciate any insight as to the magnitude of the problem and advice regarding a repair.