I just purchased a used (1987) sunfish with which to teach my granddaughters to sail. It was stored on the ground with the deck side up. The bailer scoop was filled with dirt which I've removed and I've cleaned the scoop. The soft o-ring on which the ball seats is out and loose. I purchased a new ball and o-ring, but cannot get the o-ring installed. Is there a trick to seating the new o-ring? I can't find a manual or any instructions. Thanks for any help.