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Thanks for the links Hans,
After going back and double checking things, it looks like i've been chasing a ghost that didn't exist.
The problem of the donut shadow in the black central spot being off centre was actually due to the slop in the Tak collimating scope - The focusing / sliding component of the Tak scope has a fair bit of slop in it.
Takahashi - shame on you.......you are supposed to uber precision brands......they should have made the slider bit as some sort of twist / screw mechanisim which would not result in these types of issues.
Rich.
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