sorry to seem thick,i have just got a draper co2 regulator for disposable welding bottles,i have a spare JBL bottle ,are these bottles the same? i have screwed the reg onto the jbl bottle a little way and the thread is the same but i am a bit unsure about screwing it on all the way if it is not compatable,i would be grateful if anyone could just clear this up for me ,thanks,skankypup.