marposs IWAVE2 Instruction Manual page 66

4) Secure the plug head using the Star Lock system. This system enables
the user to change mechanical plug heads quickly and without using special
tools. The plug heads may be tightened, using a wrench to apply a torque
of 10÷15 N/m to the lock nut, expecially for diameters in excess of 120
millimeters (5 inches). Always apply a force towards the handle to ensure
positive seating in the locking collet as the Star Lock is tighten.
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/ - Instruction Manual