How about to increase force of thrust?
If you attach a cord to the butt end of a spear, wind a few turns around the shaft, then wind the other end of the cord around your hand, and position the hand further up the shaft at point of balance, you have effectively increased leverage allowing a heavier thrust, or alternatively, the handling of a heavier than normal weight weapon. The turns around the shaft provide spin, giving stabilisation.In a projectile weapon the cord acts as a spear thrower, in a weapon not intended to be thrown it allows a heavier thrust and a loose hand thrust to the end of the shaft, giving longer reach.
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