An assembly comprises an arm, a first connector, a second connector, an elongate member, and a shock absorber. The arm has a first arm end, a second arm end, a bore extending longitudinally through the arm, and an opening proximate the second arm end providing access to the bore. The first connector is connected to the arm proximate the first arm end, and the second connector is connected to the arm proximate the second arm end. The elongate member has an intermediate portion interconnecting a first connecting end and a second connecting end. The first connecting end is connected to the second connector, the intermediate portion extends toward the first arm end and back toward the second arm end, and the second connecting end extends through the opening. The shock absorber has a first portion connected to the first connector and a second portion connected to the intermediate portion.