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I agree with Hagar - the springs on the Bintel 12" are very poor - I found it losing collimation just moving it in altitude. When I replaced them with stiffer springs, I couldn't believe how flimsy the standard springs were.
There are lots of variables with fast newtonians - work patiently through the problem, ask lots of questions. The best thing would be to get an experienced local amateur to have a look at your scope for you.
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