If you know the Starlight Instruments Feather Touch focuser - then you dont need to read any explanation about it.  You already know.  In case you don't let us fill you in...

Starlight Inistruments makes the worlds finest telescope focusers.  Some of the world's most elite telescope manufacturers would not use anything but the best and choose the Feather Touch Focuser for their stock focusers.  Many serious astrophotography enthusiasts that use telescopes without a Feather Touch Focuser will immediately change their focuser to a Feather Touch.

For achieving perfect focus you need a focuser that is smooth as can be.  With ultra-fine detail adjustment.  Only the Starlight Instruments Feather Touch focusers can offer such perfection.

Specifications 

• Other Info DT Length: 2.95/74.93mm
• Focuser Housing / Base 2.75"/69.85mm OD NT flange
• Draw Tube Travel 1.6"/40.64mm
• Racked In from Mounting Face 1.405"/35.687mm
• Racked Out from Mounting Face 3.005"/76.327mm
• Racked In Draw Tube Below Mounting Face 1.52"/38.56mm
• Diameter at Back Side (Eye Piece) of Draw Tube 52.020"/51.31mm
• Thread on Entry (OTA | FRONT) Side of Draw Tube Female 52x0.75mm (2.0" diameter)
• Draw Tube Drive Mechanism Crayford Type Friction Drive
• Draw Tube Drive Material Steel on Steel
• Draw Tube Linear Bearing Style Dovetail-Ball Bearing
• Draw Tube Linear Bearing Material Steel on Steel
• Reduction Unit Type 2.0 Inch Planetary Drive
• Reduction Ratio 10.25:1 (Approximately)
• Travel per Pinion Revolution 0.785"/19.94mm
• Lifting Capacity 8-10 lbs
• Travel per Fine Focus Knob 0.077"/1.960mm