A kit features two arm assemblies, each of which features a longitudinal member with a padded portion extending from proximate one end thereof toward the other end and a connection at each end allowing horizontal and pivotal motion of the arm assembly about. A method of mooring a watercraft involves connecting each arm assembly between a respective connection point on the watercraft and a respective securing point on a body distinct therefrom, allowing horizontal pivoting of the arms to horizontally move the watercraft toward a vertical plane in which the securing points lie and blocking further horizontal pivoting of the arms by contact between the watercraft and a respective one of the arm assemblies before the watercraft reaches the vertical plane. The arm assemblies bind due to contact with the watercraft, thereby blocking impact of the watercraft with the body to which the securing points are mounted.