anchor: PulleyJoint:setMaxLengths
  Set the maximum lengths of the rope segments.
  
  The physics module also imposes maximum values for the rope segments. If the parameters exceed these values, the maximum values are set instead of the requested values.
  PulleyJoint:setMaxLengths( max1, max2 )
  max1 number The new maximum length of the first segment.
  max2 number The new maximum length of the second segment.