Hello Paul,
I just now came across your post about EX-3 shoulder mount solutions; wasn’t sure if you figured it out or not, but I know many who are looking for a similar solution. I built something for my Z7U that might work for the EX-3. Much better as far as balance (this was main concern, as I too come from Betacam shoulder mount past); curious if you think it would be worth adapting this plate I built for EX-3.
All the best,
Charles Phred