Mines the same!!
I can hand tigthen the adjusting nut, that solves the problem, but puts the output pressure up as well.
The bottle is not loose on the reg, but the adjusting nut does seem to cause a "loose" feel. And how come I can adjust the pressure by hand, thought you needed the "missing" spanner?
I have mailed NitroDuck.....but not had an answer yet!!