To fix it you need first the buy any corrector plate
Used or new.
Then drill the center center hole to match the ..
Original central hole size.
Then you need to re move coating of the secondary.
Then re figures the hyperboloid of the secondary.
Which is very very difficult and need special test equipment such as an expensive FLAT of 8 inch and other eequipment.
Then have secondary mirro re alluminized .cost arount $190.
Each process is very difficult.
I buy it just to see if I can get a used corrector plate or may be spares.
Cheers.
0449668675
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