So I have been wondering since getting it, what is the purpose of this top hole on my TH? I have disassembled it almost completely, I've never taken out the needle packing as it is waaayyyy more difficult than my Microns, and is functioning like new still. I was thinking maybe a lube hole? But for the trigger I'm not sure cause you can do that on the side cutouts. So my other reasonable deduction is that it's used to access the trigger air valve once the packing is removed. But like I said it's perfectly fine, not dragging, not leaking, and since this packing takes a big flathead to remove, I figure I'll just leave it alone till necessary to avoid unnecessary tool marks. Anybody else got one, and have stripped it down to the frame?