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Nige, I've found that the Kodak canisters best fit a 1.25" focuser.
What will an overtight held mirror image look like? The mirror will focus, but the image will be a little soft (particularly at high power), and when you defocus the image, the "doughnut" shade that appears on stars will look elongated or grossly distorted, rather than a nice evenly round shape.
Only too happy to help, mate.
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