SCT 2" visual back

I'm looking at buying one of the SCT visual backs that allows the use of a refractor style diagonal (AP Maxbright) and have a question: Are the visual backs with 2 compression ring screws, like the AP and Mercury Support Systems, better at holding a heavy load than others, like the Televue, that only have one screw ???
Thanks and clear skies,
Robert

Make sure that your focuser tube has a diameter of 2" or it is a waste of time.

I'd rather have a 2-screw back when connecting cameras and guiders and extension tubes. Those configs add a lot of weight and length.

But, for strictly visual use with an ep and diagonal, a 1-screw should be fine.