GSO Primary adjusting screw size?
Posted 05 January 2013 - 02:08 PM
Posted 05 January 2013 - 02:32 PM
Posted 06 January 2013 - 12:59 PM
They are metric M7 on my 2005 vintage 12" GSO dob. A very unusual size almost never found anywhere. The locking screws are M6. I made my own by having a 8 mm stainless rod threaded M7 at one end and M8 at the other end. Then I locked a M8 thumb-nut (locktite) to the 8 mm end. The unthreaded 8 mm section gives nice and "slop-less" operation and it just fits the holes in the rear casting.
The Farpoint Astro website sells two different knob sets with 2008 as a year when the size changed, but does not say what the difference is. Telescope Service (in Germany) defines their Farpoint knobs as size M6. My guess (pure guess - no firm info) is that pre 2008 the size was M7, and 2008 and onwards M6.
Posted 06 January 2013 - 06:19 PM