Suspension mounting system for ST-250 stringing machine:

Six-point mounting system provides 10-point maximum supports and eliminates any racquet distortion. Padded head mounting post and throat mounting post could move in and out without any adapter. Single-action quick shoulder support arms: turn a single knob to control both shoulder support arms. Padded, V-shaped shoulder supports perfectly fit against the frame. Padded head and throat mounting posts secure any frame, no cosmetic damage to any frame.

Which stringing machines have this suspension mounting system?