Yes Erick,
I did that test, wind the focuser all the way in and out, and the beam stayed in the same spot. Also tilted tube up and down and again all the same. I actually got the idea for "V" shape laser testing tool from you, very simple and it works fine. Thanks mate!
The only thing I noticed are the locking screws on the primary. You know when I finished all the adjusting and as they always say try to tighten instead loosing it 'cos of weak springs. I find that I have to tighten locking screws unevenly, otherwise the laser beam goes out of centre a bit, just a bit but that shouldn't happen? I don't use screwdriver for this at all, only for adjusting screws 'cos I can't turn them with fingers.
The collimation stays good for a long time, I take care taking it in and out. Don't know hows it going to be once I transport it out to dark sky, if this rain ever stops.
The other day I had to take primary mirror out 'cos the bolts and nuts that hold the round plastic bit on the sides of the tube that sit on the mount became very loose! I couln't reach in to hold the bloody nut, so I had to take primary mirror out the tube and tighten it. Someone told me I should use naylock nuts for this, but I hope I tighten them enough.
cheers
BTW, I noticed you have Televue 3x Barlow, I have the same one. You could make Barlowed Laser with that one very easy, and its long maybe enough to see it when wind focuser in. The bottom cover where its written TeleVue (black cap) you can drill very small hole, make sticker from white paper and punch hole on it. The best one would be the one that you can peel it off if you want to without leaving glue on it. Stick it on the cap, take 1.25 inch adopter out from the focuser, put Barlow in and from other side plug it with the cap with that white sticker on it, and together like that put it back into focuser. This way you don't have to worry about damaging your TeleVue Barlow. Now you can put laser into Barlow and fine tune it
