Hi M boaters, I had planned on letting the composite shop at the marina handle the wet core under my mast but they were not eager to work on it so I decided that today was a good day to make a hole in the deck. After taking off the hardware including the tabernacle and another compression board I jacked up the ceiling with a post and a floor jack. Then I opened up the deck with a roto zip and a lot of effort since nothing was delaminated. I had enough time to cut back to dry balsa on most all the sides. The balsa right by the holes for the hardware was black but mostly what I removed was wet. Once I get back and verify I have all the wet core out I will see about putting in some solid fibre board. The shop recommended bluewater 26. I was surprised that the bulkhead is not in contact with the ceiling so I guess the design was for the load path from the mast to tie into the bulkhead via the three boards on the end and the trim piece on the top of the bulkhead. It is easier to figure out the loads on an M-17 eh? I will keep the pictures coming as the project moves forward. Cheers Robbin