I have a17' Oday Sailer II. The centerboard is raised and lowered with a fore and aft cable that travels inside the centerboard housing out of sight. Yesterday while positioning to raise the mainsail, I lowered the centerboard and it stuck in the sandy bottom. The shifting of the boat seems to have pulled the forward cable beyond its normal stopping point and it is now jammed so it cannot be pulled to raise the centerboard. I was able to push the centerboard back into it's housing but I am not able to release the forward cable. Is there a construction diagram available somewhere for the centerboard operation?? Or have any of you encountered the same problem?