No the cyclinder needed to be re-certified because it had expried, hence it was at the metal recyclers. It has to be a CO2 fire extinguisher, you can't convert other types to hold CO2.
Also even if you left the handle thing on top you would need to take it to shop, because if you look closely you can see that the pin is still in and the handle isn't depressed, therefore it must have had the valve removed from inside. Also you would need to have a fitting attached to to the output to attach the regulator to.
My one has had the whole handle part removed and a normal valve attached.
I just checked the invoice which is still attached to the bottle, valve was $100, cert was $20 and fill was $25.
The only problem I came across was finding a certifier that would do it, the guy at wards in the hutt wouldn't do it and told me it couldn't be done, and that my only option was to buy one of his $300 cylinders. Haha, and he was grumpy.
The guy in Porirua was good as gold and had it done the next day. He also sold me a regulator at really good price.