Yes, ha-ha, for locking down the velocity adjuster. I ask because the classic adjuster doesn't seem to need any 'locking down'. It's a small, smooth screw, with very little surface to get purchase on. Were they "just because" kinds of things, or would they still be required today if someone used a classic mag in a tournament? Why don't the RT and descendant valves use them? I know the RT velocity adjuster is larger in diameter.