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Patrick
There’s a vague three-fold symmetry in this spikes. I’d say something is protruding into the light path, aside from the spider - probably retaining clips or fingers on the primary mirror cell, or the secondary cell.
Take a close look at the secondary cell as well, if this has any lumps or bumps that result in a non-circular obstruction in the light path, these will cause spikes.
Another no-no are the ends of bolts sticking into the light path from things bolted on, like the focuser, finder or guidescope rings.
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