The Roto-Grip Locking Super Rotomatics® (509 Series) utilize the famous Rotomatic® design with a “thumb screw” mechanism which locks the string into place. The 3-step button gives these machine heads a distinctive look and sets them apart from other Rotomatics®. With 18:1 gear ratio.

The 509 Series utilize the famous Rotomatic® design with a “thumb screw” mechanism which locks the string into place, allowing for quick string changes. To operate, insert the string through the post hole, wrap around once, then lock by tightening with the thumb screw. The 3-step button gives these machine heads a distinctive look and sets them apart from other Rotomatics®.

Specifications

• Sealed-in, lubricated gears
  
• 18:1 gear ratio
  
• 25/64” post hole
  
• Post length to hole: 23mm
  
• Overall post length: 28.2mm
  
• Weight per pc/per set: 1.6oz/9.6oz
  
• Max. string gauge: .074”
  
• Hardware included (bushings, washers, screws)
  

Drop-in replacement for

• 102-18 Series
  
• 102V Series
  
• 103 Series
  
• 106 Series
  
• 109 Series
  
• 109-18 Series
  
• 135 Series (Top mounting hole will be visible)
  
• 136 Series (Top mounting hole will be visible)
  
• 502 Series
  
• 509 Series