Cabin Sole Plugs
I needed to enlarge one of the bildge access hatches on my 37C to gain better access to my knot meter and depth sounder. The flooring consisted of two layers of 1/4 to 5/16 inch fibre glass with 1-1/4 inch plywood embedded in-between. The cabin sole was basically just a teak and holly veneer less than 1/8 inch thick glued to the fibre glass floor structure. The piece I happened to remove had one of those plugs in it, to my supprise, since there was no screw in it. The wood plug protruded into a hole in the fibre glass floor. It's only my assumption that these plugs are installed to prevent the laminant from sliding around while the laminant is being installed and glued. The good news is that the glue was a soft plyable glue somewhat like rubber cement for paper. By being careful, I was able to successfully peel the laminant off the fibre glass floor fairly easily with a metal spatula without destroying it. However, I was only removing a small piece about 5 by 6 inches. (I wanted to re-use it to fabricate a new hatch). Hope this helps.