Hello all, a quick call for support. I've got a bunch of format carriers with various clamps. In an effort to get my kit standardised, I though I would quickly switch the clamps on two sets of F-carriers. I've got a set with the old screw-type clamps and another one from a 6x9 with the latest push-type clamps. I get to the point where the stands are out and I see the allen-key bolts on the front carriers. Neither will budge. So I disassembled the plate that covers the allen-key bolt on the rear carrier, it won't budge either. Looks like it is secured somehow. Rather than applying too much force, I have stopped by effort for now, but would appreciate any advice you may have on switching out the carriers. Simply interchanging them is not desired, the modern clamps are on short/light 6x9 carrier, I want to put them on the more solid 4x5 carriers. For just 4x5 they would probably do, but I intend to fabricate a monster arca in some exotic formats so I want the additional rigidity. Thanks for your thoughts!