Thanks for the offers guys, I've had another attempt with a Cheshire eyepiece and it looks centrally even and it's no longer drastically mis-aligned. Since I have no experience with the Tak collimating scope I might have to take up one of your generous offers. But before I do so I will rig up with my camera and see if I can collimate using the DSI collimating procedure and Al's collimation guide on real stars.
It's gratifying to know there is a plan B if I need it.
Thanks so much for the offers.
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