HI I have a Tasman model 4500 cooker,i bought the Doblo without a gas cyclinder ,i was told a Camping Gaz 907 would be needed,and this fits in the locker compartment,any larger cylinder would not fit.i had to use a new regulator to convert to Camping gaz,problem is the cooker will light on just 1 ring and once the control on the cooker is released out goes the flame.any ideas,any help much appreciated.Thanks