PeterBolt Posted January 13, 2021 Share Posted January 13, 2021 So last night I decided to take the plunge and clean my primary mirror. I followed the instructions on the Sky at Night website and it went pretty smoothly and I am pleased with the result.However, when I came to remove the mirror in the first place I noticed a couple of things 1) the retaining clamps were very slack, approx. 3mm between the foam pad and the mirror surface and 2) the mirror would not rotate as silicone had been used in three positions to hold the mirror in situ.Now that I have removed the silicone and fastened the retaining clamps using the "business card" method the mirror is very slack. Mainly in the radial direction as there is a gap between the edge of the mirror and the housing. This allows the mirror to move from side to side by approx. 2mm.Can anyone tell me if this is correct? or do I need to make some shims to go around the perimeter of the housing i.e. around the edge of the mirror to keep it centred?Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
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