In the "simple", inexpensive Newtonian telescopes, the focuser can be adjusted using small grub screws

On "simple," inexpensive Newtonian telescopes, the focuser can be adjusted using small grub screws to prevent it from tilting. This provides pressure at two points on the drawtube, providing better guidance.

www.teleskop-spezialisten.de/shop/Newton/bis-200mm/BKP1507OTA-Skywatcher-Explorer-150P-Newton-150-750mm-2-Tubus::879.html

 

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