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A properly operating rope tensioner will work with the ropes to keep them tight but not allow them to stretch as a result of wads passing through the system. The sliding carriages in a tensioner are designed to move to adjust for wads caught in the ropes, normal elongation and shrinkage of the ropes as a result of the combination of wear, moisture, and heat. Running the ropes at a constant high tension negatively affects threading by reducing the diameter of the ropes which may result in the ropes failing in the open draws. Additionally, the ropes built-in elasticity and ability to recover from wads and irregularities in the system will be reduced. Excessive tension on the ropes at any time will lead to premature failure of the ropes, shivs, and shiv bearings.