Hi
from experience when collimating my GSO 14 inch RC (Truss) design
I’ve used the
Tak collimator / Howie collimator (green) and the new R.E.E.E.G.O collimator All providing slightly different results... question is which one do you follow!!!
one reason was the focuser end, I have three grub screws with a copper compression ring,
Good way to test the howie is, insert the laser into the focuser, slightly tighten making sure it’s plush then rotate the howie, whilst observing the laser dot, if the laser dot moves lot ( up down etc ) then it’s not collimated Correctly best advice is to look at a real star at night and work from that.
tools will only give you rough error