String clamps are typically made of two kinds of materials - either metal or composite resins. Metal clamps are better, but they are more expensive. Composite resin clamps are less expensive, but occasionally they won't be able to hold the string over 65 pound tension.
• What is the difference between single-action and dual-action swivel clamps? The single-action clamp is a one piece assembly - both the clamp and the base are attached to the turntable. Unfortunately, the brake of the single-action clamp wears out with frequent use, requiring regular maintenance.
In 1990, the Wilson Sporting Goods Co. Introduced its Pro Staff (Prestige) stringing machine, which was manufactured in Taiwan. It utilized the single-action swivel clamp assembly, and it had brake problems (as mentioned above).
Wilson Sporting Good Co. Discontinued its production 2 years later. Current model stringing machines, utilizing the single-action clamp, are actually clones of this particular Wilson Pro Staff ( ... more.
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