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Hi Michael,
well done on looking at collimation with a Tak scope. Ok first things first.
You will need to adjust the primary at some point. If you want perfect collimation you will note your primary will have moved during transit and you will need to adjust it.
Michael which scope do you have? Do you have the camera collimation ring? If so then I will go through the procedure.
Step 1.
Centre the ring marked B in your diagram over ring C using the secondary screws. The screws need to be snug but not too tight.
Step 2
Next more the primary. In your case right now you have to move the primary as shown by your first image. Ring E has to move until it is concentric with ring F. The small screws are the locking screws and large screw is the actual collimation screw. Again snug but not too tight is the order of the day with regard to the locking screws. Be mindful that when doing up the locking screws they can move collimation a bit.
Do the above steps until every ring inside ring F is concentric. You might need to do this several times to get it perfect. Be very fussy.
Now if you have the camera collimation ring on a 12" scope or on a 10" as an extra you can move all the rings inside F as one to make the F ring and all others concentric with the very outside aperture. Make sure you also look for the very tiny Tak rings inside ring A with a very small white dot in the centre of those rings. Once you see all those rings concentric and all other rings concentric you are truly collimated. If you get collimation that good you will not need to do a star test. The important part is looking for the little tak rings. You will need to hold the light source at exactly perpendicular to the white disk to see the rings properly. Just a tiny bit out will mean sacrificing a lot of sharp detail. These scopes are very finicky when it comes to collimation.
This whole procedure takes about 20 minutes to get 100% accurate.
Now importantly, do not bother doing this until you get your new focusor. It sags and that will affect your results. The focusor that comes with the scope is rubbish and will not hold collimation or anything else for that matter. However, it you just want to get some practice in, then just set the scope up on a table and just practice.
If you need to ask more questions please feel free to do so. BTW your rings image made my explanation so much easier.
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