These Guitar Machines Are A Triumph In Engineering And Style. The Housing Provides A Maximum Bearing For Worm Gear And String Post. Gear Ratio Is 14:1. Worm And Gear Are Precision-Cut For Perfect Meshing. This Eliminates Backlash And Slippage. Countersunk Tension Tension Screw Permits Players To Regulate Turning Tension To Any Degree. Gear Box Has A Special Lubricant For Lifetime, Trouble-Free Service. Includes 5/8' Washers, Bushings And Wood Screws.