OK Baz its been five years ..think of a pregnancy all the pain comes where its near finished
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As I said before I was not sure exactly the problem but it must be that the forks are not parrallel so lets address how to fix that.
Get the thing as parrallel as possible fix on a close star and rotate the scope on RA all thru 360 degrees whilst looking at the star ..if the scope and the RA axis is parrallel it will stay centred
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You are a can do guy does this makes sence to you it makes sence to me
..maybe the forks are such that where you think it is parrallel it not if you see what I mean.
Anyways you and I both know the positive thinking will win negative thinking will only make it worse
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But heck irrespective of the breed of scope mount etc all I say /you say it must work its simple mechanics
..er I hope its simple
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Take it easy relax and look at everything you have done not remains undone and hide the axe
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Maybe drift is the only way but I cant see what we could be missing.
This time next year you will look back and laugh when you see the photos you have taken during the year
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alex