Just don't be worried about it too much. There are recommendations that you should check collimation every time you get the scope out. I probably only tweak mine a bit every 5 or 10 times i use it as i have found that it holds collimation well.
If you take it in the car lots or it gets a few bumps when carrying it outside then the mirrors might need a little bit of tweaking more often. Apparently, the smaller the mirrors the less often you should need to collimate.
I've got a Saxon Laser collimator which i bought from Star Optics on the Gold Coast but you can buy them online for about the same or less. It's a good tool to get it 'about right'. I've also recently started using the 'star' method for collimation and that seems to work well too.
cheers
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