I have owned and sailed a Morgan 25 for 43 years and have much experience with the maintenance of the centerboard pennant. The pennant requires frequent inspection and service. Morgan service manual recommended inspection every two years and possible replacement. Common failure is failure of the 19.25 inch long wire just aft of the metal tube due to corrosion and flexure. Service is critical because failed wire can permit the steel tube to come out of the seal and cause a serious leak. I don't know where pennants can be purchased. I made mine and replaced the pennant approx. every 5 years.