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I missed the mirror clips too! OMG! That's going to cause some nasty pinching. The clips should just barely touch the mirror, screws essentially finger tight. I use lock-tite on the screw threads to make sure they stay put w/o being tight.
No probs collimating your old f/4. I use a Cheshire/sighttube and star test to recheck.
In the shop they can collimate the laser only so well. That is probably good enough for medium power visual use at f/6 or slower, but beyond that they are not accurate enough. To collimate the laser itself any better gets very tedious.
Look up the barlowed laser method by Nils Olof Carlin (and published in S&T). It is a good one, and competely insensitive to laser misalignment.
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