hi there John
I have mine on a G11 mount and it handles it very well I have a Stellavue 80mm finder and a TS 80mm guide scope I re mounted these at the back of the scope as you need a bit of weight at the rear to achieve balance not sure if you will have the same issue with the 12" but there are tapped holes around the rear cell rings where you can re mount the losmandy plates I will get a pic of my set up for you to look at to achieve focus I still need an extension I noe have a 47mm Baader click lock extension works a treat
cheers Pete
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