My apologies if this has been reported before. Campingaz Lumogaz C200 lanterns are very good lightweight lanterns. Used ones are cheap in the UK and mainland Europe, and although they are not always complete, replacement glass 'domes' and mantles are readily available. The pierceable disposable canisters are also still available, although they are getting expensive. A much cheaper way is to refill them from a larger butane cylinder/canister. Make sure you only use butane for refilling and not propane or butane /propane mixtures. To make a filling adapter you need a cheap Chinese EN417 Lindal valve, a M10 extrafine threaded bolt and an aluminium washer. Take the lantern attachments (including the jet) off the canister holder, leaving just the valve attached with it's exposed thread. Cut of the head end of the M10 bolt with 4 to 5 complete threads attached. Drill a 4mm hole through the stub and file a slot for the gas path. Cut the hose connector end off a cheap Chinese Lindal valve and braze it centrally onto the bolt head. Fit the aluminium washer and make sure it makes a good gas tight fit onto the lantern valve. Then firmly connect a suitable flexible tube to the filling adapter To refill an empty canister, leave the empty canister fastened in the holder with the valve attached as shown below A C200 canister contains 190gms of gas when full. Make sure the assembly you are going to refill is completely empty, then weigh the empty assembly, and add 180gms. This will be your maximum final weight (with a small safety margin). Then put the assembly into the freezer for 15-20 mins. Remove the canister from the freezer and connect the filling adapter. Connect to other end to the donor cylinder/canister. Open the lantern canister valve first, then open the donor valve. After 15 seconds close the valves (donor, then lantern) and disconnect the filling hose and reweigh the assembly. You can then estimate the total time it will take to reach your maximum weight. Keep refilling in stages until you reach the final weight. This is the refilling rig connected to a small bayonet type donor canister. With the correct donor valves and connectors you can use any size butane cylinder/canister, just make sure you only use 100% butane and not butane/ propane mixtures.