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Thank you all for your replies
My primary is made by nova optics. I built the scope from scratch. The only parts I bought were the mirrors. Everything else I made including the mirror cell, spider and holder. My holder I need to silicone the secondary to. So installing different size secondary is no issue. I just had a guess about the 3.1” to begin with. I might still keep it that way from your advice, but finding a better quality secondary will be my aim now. Thanks again for your replies, it’s much appreciated. Also I am very very new to astronomy, so some of the things you wrote just flew over my head. But I did understand most.
Thanks guys
Daniel
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