Originally posted by marquis1955 Where did you find the plate is it ARCA swiss compatible in case I find one of those A*600 beast !
I recently received a Lensmaster RH-2 Black gimbal head from the UK in one week from order time, including shipping from the UK to a rural delivery in Canada. The head came with two plates, ARCA swiss compatible, 50mm and 140mm. I suspect that Rob will sell you a 140mm plate if you need it, but you can probably get one from B&H or other local suppliers.
With my M400, I found the short plate was sufficient. It slides enough that the change of balance with and without the AFA 1.7x can be accomplished by sliding the short plate from one stop to the other. The long plate on this old lens overlapped the focus ring, and that made it awkward to use. I also found, for me, that I mounted the lens with the vertical side to my right from camera position. I use the focus ring with my left hand and the entire lens is open to my hand using this orientation.