How to Replace a Winch Seat/Post on a Small Boat Trailer

Pls remember to wear PPEs like goggles and gloves.
Sturdy Built Adjustable Galvanized PWC Trailer Winch Seat Mount with Roller and Hardware (26766)
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www.sturdybuil...
Bolts are all 1/2 inch-13.
Winch
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Nuts and Washer
1/2 in. Zinc Flat Washer (6-Pack)
www.homedepot....
1/2 in.-13 Zinc Plated Jam Nut (4-Pack)
www.homedepot....