FX FX Impact M3 a tip for adjusting 2nd regulator safely YouTube video

A ball head wrench will eventually cause problems but they do work. I just made ole ugly. It fully engages the adjustment screw squarely and I’ve never had any issues.

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So you have an extra benefit by using the down rail with a slot.

To me an ordinary Allen wrench works best and keeps the brass screw in perfect condition if adequate space is available to use it.

It's just how I take it.

Bhaur
I can also access it from the side without an issue. This is why a ball head is needed for those angle like in the second picture. I haven't damage that bass screw.