Telescope Fine Focus Assembly - Bresser Messier 254 Dobsonian
thingiverse
Fine focus arrangement (6:1) for Bresser Messier 10" Dobsonian Telescope. May fit others.This is a DIY alternative to the fine focus knob commercially available for ~£93. Once fitted, you will have one knob which moves the focuser at the normal rate, and one which moves it at 1/6th the rate. The modification is fully reversible. The assembly of this arrangement is straight forward, but I've provided (probably) overly detailed instructions. For those who aren't mechanically minded: All the screws are small, none of them need to be very tight, don't force anything.Other parts required:2 x M2.5 x 6mm Cap Head Screws2 x M3 x 12mm Cap Head Screws1 x Jackson Brothers 4511DA 6mm Ball drive dual anchor (I bought mine from eBay for around £12)Original file location:https://cad.onshape.com/documents/1dbb00339e42cf85fb3b3296/w/751956d19cdf779257ad3ff6/e/0e43900906e9a600decb83c7
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