Hi Dean,
have you considered retaining your 9x50 finderscope and mounting your Red Dot finder / Telrad adjacent to the existing finderscope.
I have an 8" Dob and find that the combination of both finderscopes is very convenient.
I use a Red Dot finder to aim my telescope on the targeted object and check it out with the 9x50 if required.
Cheers, Ric.
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