Went out to fly to see what an ND filter would do to my video. With old-man hands and fingers tried to unscrew the current "lens" off my M2Z, no luck. If I have the Zoom on its back with the camera facing me, I'll rotate it to the left to remove it? (Lefty loosey, righty tighty?) Do I need a wrench of some kind the first time I try to remove the stock "lens"?