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David
You can do the check anytime - remember you don't have to look through the telescope, just "eyeball" the alignment of your spider vanes from the top of your scope. I have attached a picture I just took of my upper cage assembly that shows the offset in the oposing spider vanes (in the directions of the arrows). It is subtle in the photo, but is more noticable in person. If you extend one of the spider vanes past the centre with an imaginary line you can see that the extension doesn't overlay the opposing vane. You can also notice from the picture that I have no flexibility in adjusting these vanes, so eventually I will replace them (possibly with a curved vane).
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