after removing my old Ideal windless I discovered that at the drive shaft hole the core in my fore deck is water damaged and the deck has pulled away. After sounding the deck with a mallet I am going to need repair approx. 3 sft. of deck. INTRIM was built in 76, does anyone out there know if the foredeck core is plywood, balsa or something else. I want to have all the proper ingredients on site BEFORE I cut into the deck. Thanks