I own a Minn Kota Riptide 74lb thrust trolling motor and I noticed it making a different sound and it was vibrating. After removing the prop, I noticed that the metal pin that goes through the shaft was broken on one side allowing the prop to rub against the foot of the motor. Can this pin be removed and replaced, or does the entire shaft need to be changed? Do you know of any websights that the required part could be purchased? Thank you in advance for your help.