Protank atty head pin is press fitted. So, turing wouldn't raise or lower the pin.
My guess is that, when the atty is tighten too hard, the pin squashes the grummet which could be making a short.
So, either lower the pin from the mod (which can't be done in this case) or shorten the atty pin by either sanding it down or use double o-ring.
Sorry Zero, yes it does work. I have done this many times with success with boges and protank mini's. Usually with the protank mini's it is to lower the pin to make the connect with the firing pin on the battery. So I know it works and have talked many a new member thru the process and they have success when following my advice.
But to each their own. Try it or not. Your choice.