... and complete Multiple Worm Gear Screw Jacks for the electromechanical adjustment of linear movements.* Comfigurations: worm gear screw jacks,spiral ... linking shafts,couplings,additional guides,electric motors.* Worm Gear Screw Jack Systems is of heavy duty,self- ... mounting bolts.* Manual Operated or Electrical Drive.* Worm Gear Screw Jack Systems Application Industries:Theatre and stage construction ...