Hi Ian,
You asked how we mounted the lens - we used a fairly heavy duty manfrotto ball and socket screwed into a bit of wood. The wood was screwed this into the top of the tube rings. Its a bit rough and ready but fairly low tech and it works. It seemed quite well suited to Michael's lens which sat pretty securely.
I have had a C90 mounted on the platform with the ball and socket as an autoguider when imaging through the main refractor and that worked ok too.
Cheers,
David
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