In regards to those accused, or accidentally become what is known in Reo Land as "BUTTON MASHERS":
This idea was someone else's, in an older Reo thread, just tried it and thought I'd re-share it. Pushing the Reo button to hard, too far down, is not great for the fire pin, nor the battery spring over time. My Chalice rba is so quite it's almost impossible to here the atty firing, so I was concerned myself about constant over pressing of the button, which is easier as well if like me you use a button cover. If you place an O-Ring below the button cover, it forms a limiter on how far down you can press. Since I could not find the original post, I did not know what size O-Ring to use. Went through all my tank rings, flashlight rings, and then remembered the extra ring I bought with the 3ml bottle. Fits perfectly over the pin switch, but more importantly allows my atty to fire at just the point where it bottoms out on the ring, no longer potentially driving both pin and battery down any further. Added bonus, you don't have to give button pressing pressure a second thought, we all have different finger pressure, now just PRESS as you please with no worry of damage to the device parts.
Over geeky, perhaps, but it took me 30 seconds to install, and if a bit OCD like me, it looks better installed, then stock, as I did not like the look of the large gap between the button cap and base of mod, this fills it a bit, I understand the fire pin needs travel and the cap can only be drilled out so deep. I just find its an added look thing if that matters to anyone. So that's my 1,000 words, should have just posted this picture instead:
Per the Sloth... an o-ring size that can work for the Button Masher's mod is 1.5mm X 6mm.