Cheers Andy.
I did look at Arca Swiss. Some serious stuff there with double dovetails.
Possibly for 10 x 8's.
As mentioned, what you have gave me the idea, and I will be certain to do a bench stress test before hanging my camera from it
. If the lever is not good I can easily convert to a screw. I am quite positive all will be OK as RRS seem to do them but at a serious price, and RRS seem to have a good name in the States.
Don