Yes, David the GSO focuser is a **** to mount any finder base i've found, bit of an oversight on their part, i do have a gen GSO finder base mount, but still very weak mounting point. Simply drill & tap 2 holes in your tube rings to suit your finder base, might need to file the base legs a little to suite the curvature. And make sure the screws are not too long that they push into the tube when you tighten them down.
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