Collimation help

[fauxpas (Tony)]

Was laser collimating my 4" desktop dob today (the collimator came in the mail) and ran into trouble when I realised after I adjusted the secondary mirror, it was pointing in the centre but the mirror's centre is not reflective...

Bugger!

Took me ages to work out what I was doing wrong... I'd seen all the youtube videos and thought it'd be easy but no matter how I adjusted the primary, I couldn't get a nice red dot onto the collimator target...

I ended up getting there but had to work off the feint laser reflection... Anyhow, it's better than it was before I started...

[Marcus]

I easily found the centre of my primary mirror and centred the laser.
Then I need to face the laser to the back of the telescope and check it is in the middle of the target, where the hole is. I get no laser spot, and a little bit of "spray" as it suggests around the hole I guess, but can't turn the mirror to move the spot out to check I am really there. I do occasionally get a laser line across the target...does this even matter?