Secondary mirrow spider
thingiverse
The original secondary mirror holder of the [3" Celestron first scope](https://www.astroshop.eu/telescopes/celestron-dobson-telescope-n-76-300-firstscope-dob/p,15025) consists of a single rod, making collimation cumbersome. The design uses six m3 screws and three flat square nuts. *Update 2021-09-24:* Version two has some size changes better putting the secondary in the LOS of the focuser.
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