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Ok, so here are current pics after the adjustments of the other night. The secondary may not be perfectly positioned as I'm waiting for the replacement central bolt and then I'll do it more carefully.
However, I'm concerned with the comments about the spider vanes not converging to a single point. As you can see from the pics, there are four flat areas around the circular holder where the vanes attach. The vanes are screwed in and there is no way for them to move relative to the holder, nor does the holder itself rotate, so if the bottom two collimation screws aren't parallel with the vanes it must have been made that way.
None of the vanes seem to point directly at the centre of the hub. However I'm not sure if that matters? Do scopes with curved vanes meet in the middle? So isn't the important thing that they're parallel?
Just tested it on Canopus and there are two very close, parallel sets of diffraction spikes.
So are you saying the holes to attach the vanes to the secondary holder are in the wrong place?
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