Hello Rancidtom thank you for the reply, been there and done that but its not the answer, the problem is that a brand new valve (supplied with bottle) had the nyloc nut holding the rubber knob on was finger tight to the nylon insert, the knob was loose (very) . Also the valve was uncontrolable tight and then loose to turn - Nothing in between. MDE had it back and stated 'nothing wrong' and sent it back with the nut still loose!! etc.
That is why the request, I will not trust MDE ever again. A couple of chaps at the range have had problems with the 'Jubilee' valve as well.
Long thread in 2013.
Cheers.
Geoff.