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The Pro's Pro Challenger X is the best quality stringing machine from the Challenger line and features Automatic Clamp Bases. This drop weight stringing machine is the most maintenance free stringing machine and built to last many, many years. The Challenger X features: - Drop weight tensioning mechanism. - Linear ball bearing string gripper. - Tension range ranges from 11 to 89 pounds (5 to 40 kilograms). - Automatic Clamp Base system which work by automatically unlocking when the Fixed Clamp falls back into the Clamp Base saving a few minutes per racquets. - Includes a unidirectional clutch (locking ratchet system) which simplifies the tensioning mechanism and makes tensioning slightly faster. [Challenger II does not include this ratchet] - Six-point ing system [the highest in the machine market], eliminates any possibility of racquet distortion. - 360 degree swivel turntable with two stainless steel clamp base bars. - Four independently micro-adjustable ing arms, depending on the size of the racquet frame. - Four universal heavy duty K frame shoulder supports that provide ultimate support to any tennis, squash, badminton or racquetball racquet when stringing. - Two dual action, all metal, swivel spring assisted clamp bases, handling any type of racquet. 1/8 of a turn to lock, simply using a thumb. - Ball bearing turntable device, resulting in a fast, easy and smooth turntable movements. - Micro-adjustable head and throat ing posts, accommodating any length racquet. - Padded throat ing posts, resulting in no cosmetic damage to the frame. - All metal machine base with four rubber legs, designed to go on any flat surface. - Convenient tool storage area with rubber base insert. - Strings any tennis, squash, badminton or racquetball racquet, whether an oversized, wide or long body type racquet. - Two tennis, squash, badminton and racquetball clamps are included with the machine. - Detailed, extended manual included.