Nice little collimator suitable for SCTs, Newts and RCs (apparently also Refractors in some respect but not sure how that works). 2” barrel lodges VERY firmly inside the focuser tube, full overview and instructions available here -
https://www.teleskop-express.de/shop...elescopes.html
I bought it to use with my RC6, paid about $280 for it, but since they’re hard to get and it took so long to get here I learnt to collimate from scratch without any tools - wasted so many nights doing this so I can pretty much do it with my eyes closed now and have no real need for this any more. Opinions around forums seem to be mostly pretty positive, and I found that it was very easy to get collimation close with this - always better to finish up on a star though.
$230 inc. express post Australia wide
