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if you are atleast half serious about taking some images it would be best to replace the focuser completely with something like a gso 10:1 low profile,
they are cheap enough and will save you a lot of bother in the long run.
there are a number of things that can go wrong when imaging but focus is the one thing that you can always nail.
i dont know how easy it would be to fit it to the skywatcher but i guess you would just have to drill 4 new holes, if your still not sure or dont want to do it yourself you could take it to the machinist you were going to take the adapter to (with both mirrors removed from the ota) and say 'i need this to fit here' im sure it wouldnt cost much if you were to get them to roll a bit of scrap flat that would bolt to the focuser and the tube and it would be far superior to the standard focuser.
on top of that i always thought it was a waste of time trying to collimate anything to any degree of precision when the focuser tube slops around enough to ruin it anyway.
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