Collimation knob for SW 12"

Screw:
30mm long
ø M4 thread
inox allen M4

Knob:
height 10mm
ø 12mm

Suitable for Skywatcher 12" GO-TO dobson and GSO 12" dobson

Allen fixed by pressure (use a gum hammer) and glued using Loctite 222 o 221.