M_Boats: M-15 centerboard woes

Hi all, I need a little advice. My 81 15 has developed a stuck centerboard. It appears that the centerboard truck walls have developed the dreaded bulge. My board sticks up and while I can drive it down, I don't want to do this on a ongoing basis. I think maybe a 1/8" clearance might let it work again. I don't see trying to correct the bulge in the walls. I see either making a new board or sanding about a 1/8 to 3/16 off the width of the existing board. Has anyone done this? Is there enough fiberglass in the construction of the board that would withstand taking this much off? Thanks for any help. Ches Sugg M-15 "Mouse" (#153)