The center board is quite important for optimum operation of the M-15
...Not only that, but it keeps the cockpit dry. The hole that the centerboard pendant passes through at the very front of the cockpit becomes a decorative fountain while under way if there is no CB. Also: The operating length of that pendant is CRITICAL. If it's too long then the board uses its weight as a very powerful lever to break the hole that it pivots around. If I remember correctly there must be no more than four inches between fully up and fully down. Adjust the length with a stop knot. There's quite a bit about this in the archives, including my description of fitting a new board as a result of too much operating length in the pendant. Giles Morris Arlington VA Vancouver 25 "Dolphin" Montgomery 15 "Umiaq" Sundry small craft