Collimation on my SN10 is terrible at the moment. I use both the manual and the Weasner tips and tricks. Since I had to change my gaskets nothing has worked for me. Round stars seem impossible to achieve.
I upgraded my focuser to the MoonLite version, I have heard the MJI is better.
I think the flimsy tube is probably the main issue with the SN10.
Too many wasted hours, thinking of just purchasing a nice 10" Newtonian and using my MPCC mark III on it.
Although when I did have it nicely dialled in I find the pain not worth the reward on these. Possibly why they have become a vintage rarity!