Version Two now 70mm Diameter for more fine tuning.  Glows in dark! now made in glow in dark plastic to see knob better especially in dark. Bright white during day or when glow wears off.  Put in light bedore using or put flash light on it for few seconds to help it glow brighter. Fits over existing knob so no need to take apart anything. Easy and fast tuning when it counts!

Fine Focus Knob for Celestron SCT Telescopes 70mm Dia-fits over existing knob. Condition is "New". Shipped with USPS First Class Mail. Made and designed from 3D printing software, fitted and tested. Made from Spencer-3D, made in United States.  Comes in white glow in dark green.  but can have in other colors when requested. Just message if need a different color or need a custom part. This knob is 70mm diameter and is perfect for fine tuning its sometimes hard to do with a small knob. Faster tuning when it counts. 2 to 3 day U.S. shipping.