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Ok, thanks for the info and re-assurance. I might take it out and have a look at it then too see what is clunking then. Surly it shouldn't move that much?
Could you place something soft, like foam tape between the clips and mirror, to reduce movement, but at the same time not applying pressure to cause astigmatisim?
It seams like when imaging I should re-collimate between long subs because the OTA has moved, and thrown out the collimation? I don't do this because of the hassle, but surly it shouldn't have to be done?
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