For my Co-Ax I use the Forester lock rings. While other can fit and work, they just don't work as well in my opinion.
For my standard presses I basically don't like any of the lock rings. For the ones with the set screw toward the threads, I find that after locking them down, it makes it very hard to make minor adjustments. And if they don't have the lead shot or plastic ball in front of the set screw, then the set screw damages the threads enough to make easy movement impossible. For the split ring style, if you tighten the lock screw when the ring is tight on top the press, you can't unscrew it. So you have to tighten it with the die slightly out of position.
While playing around with using an O-ring under the lock ring to improve die alignment, I found this method worked best for allowing me to make minor adjustments without the problems listed above. Kind of like the Lee lock ring that incorporates an O-ring - that I hated at first. I never tighten the lock ring down any longer. I just compress the O-ring with the lock ring and the die NEVER moves. And I can make half a thousandths adjustments easily. I just make a reference mark on the die that I line up with a point on the press threaded insert. Works fine for me. The picture is taken with the die up from the use position so you can see the O-ring.
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