G'day Frazer,
Take a look at the bottom of P26 of the Guide. It should show the canister body, with the small outlet hole circled in red. The outlet hole on these is small, but not small enough... this is why a tiny (~3/64) restrictor is used.
If you don't have a restrictor, you can use a gas jet. Take your pipes to a place like Gameco (
http://gameco.com.au/) to match up the correct threads. The restrictor can be readily made from the right diameter gas jet (the type of jets that run the hand-held LPG torches you use to solder with).
Cheers,
Harv