With a bayonet cartridge adaptor from ebay (China) sources, I'm using the cheapest source of butane. If I wanted to give the Globetrotter a bit of extra cold-weather capability, I'd refuel from a screw-fit butane/propane mix cartridge
The 'business end' of the flexi hose is a Campingaz jet (from a Bleuet 206 - fits the Globetrotter and a stove more commonly for sale on ebay than the Globetrotter - probably easier and cheaper than sourcing an CG spare jet). The jet's silbrazed to the brass fitting on the flexi hose, which had to be removed from the hose for the silbrazing obviously, then re-mounted on the hose and crimped to secure it
Simple job to remove the Globetrotter jet nipple and screw the refuelling rig in place
Before installing an empty gas cartridge, I've smeared a bit of silicon grease on this seal. Seems like a good idea to keep it in good shape when I know it'll be some time before I remove the cartridge again to check on the seal
Refuelling. The Globetrotter cartridge was popped in a freezer for quarter-of-an-hour and the donor cartridge in hot water for a couple of minutes. The temperature differential creates an imbalance of vapour pressure between donor and receiving cartridge and with the valve on the stove opened and the control valve at the donor cartridge end opened the transfer of gas is quick and can be heard
I've found that it's not necessary to measure the weight of gas transferred, since an equilibrium is reached where the receiving cartridge takes enough and no more by the time the pressure in both carts has equalised. That point can be heard (ear up against the donor cartridge). It's simply a matter then of closing the stove and donor control valves and unscrewing the rig from the stove. The stove jet nipple is then replaced and ...
Something to note about the Globetrotter jet nipple. It's not easy to remove because of a concentric ring moulding on the aluminium stove body. Here I've machined the raised rim down to get better access to the flats of the jet to remove and replace it after refuelling