My foot pump has given up the ghost again another in a long line that i have now destroyed, as i have a nice track pump for the bikes i dont want to buy another foot pump to carry in the hippo and was wondering about co2 inflation. I used to have a small cylinder but it had leak sealer in it which i dont want just for top ups. I know the Americans a big on using co2 for tyres and to run air tools but i cant find anything here i was wondering about using disposable welding cylinder and a regulator which comes with 4mm push fit then just using a standard tyre inflator. Anyone see any problems with this? or got a better idea!!!!