John
You are using the FastenR-T1 with a P-20 Wimberley and a C-12 Wimberley Clamp, correct?
I have an off brand clamp, (I bought it because they were out of the Wimberley’s). I had some concern about the Wimberley, it has the larger knob and I had a concern it could work loose when carrying the camera to your side. The P-30 and P-40 have keeper screws that keep the plate from sliding off the clamp if it is loose, I am not sure the P-20 will have those. If it does it would give an extra level of security.
Rick





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