of a block and a sheave 7 in the preferred embodiment the main beam or barrel 2 is formed from aluminum but may be made from any suitable material a cord or cable 11 is provided having a first end and a second end as illustrated in fig1 amp fig3 fig3 shows the first end of the cable 11 passing through the pulley 15 of the guide means or block and tackle 7 and attached thereafter to a handle 8 to aid in the cocking process the other end of cable 11 enters the barrel 2 on opposing sides of the same at 9 somewhat rear of the string latching means 10 from the out side of the barrel 2 continuing to the inside of the extrusion or other and attached thereto 12 in the preferred embodiment a constant force spring 12 is used due to its compact size and its excellent characteristics of equal not increasing force throughout its extension as would be found in extension of coil springs elastic or surgical tubing as well gas or air filled shocks and lastly a spring loaded hub that usually includes a clock type spring that has an increase force as it is wound and needs ample space for mounting or installation of such a hub system handle 8 is attached for removable attachment to 16 the two are of equal.