roll 52 removed the front portion and the strap 44 are omitted from the figure for the sake of clarity and the take up roll 52 is shown with a portion of the wall removed to expose a torsion spring 70 the take up roll 52 includes a central shaft 72 that is rotatable with respect to the take up roll 52 one end of the torsion spring 70 is connected to the take up roll 52 and the other end is connected to the shaft 72 such that the tension in the torsion spring 70 increases as the strap 44 is unrolled clockwise rotation of the roll 52 and decreases as the strap 44 is rolled up counter clockwise rotation of the roll 52 in order for the take up roll 52 to rotate relative to the shaft 72 the shaft 72 is held stationary within the housing 48 the shaft 72 includes a pair grooves 74 at each end disposed on opposite sides of the shaft 72 and the housing 48 includes internal channels 76 that receive the ends of the shaft 72 when the strap recoiler 46 is assembled the shaft 72 is oriented so that grooves 74 align with the channels 76 of the housing 48 when the take up roll 52 is inserted when the ends of the shaft 72 are disposed in the channels 76 the walls of the channels 76 retain bear upon the grooves 74 to retain the shaft 72 as the take up roll 52 rotates to roll and unroll the strap 44 when the take up roll 52 is disposed within the housing 48 the tension in the torsion spring 70 may be adjusted either by rotating the take up roll 52 or by varying the.