I've bought a mini regulator and adaptor to attach to my soda stream bottle so I can dispense kegs. I can't figure out how to use it though. The wheel on the front seems like it's the adjuster knob but no matter what I do to it it doesn't put gas into the keg. Am I missing something bleedingly obvious? Got it attached to half a metre of hose and a gas disconnect. It's my only cold beer and I can't get it out on a Sunday night!

