Strut
to walk in a vain, stiff, swaggering manner. vt 1. to provide with a strut or brace 2. to make a display of; show off n. 1 the acting of strutting; vain, swaggering walk or gait 2. a brace fitted into a framework to resist pressure in the direction of its length.David:The strut is the piece(appendage) that holds the prop shaft in it's position. It is connected to the hull and the prop shaft runs through the other end of the strut.