For those who use these little cartridges, you know how quickly the price can add up. [steve] takes us through the process of adding a valve to a spent cartridge so it can be refilled. Over all, it ...
I tend to go through a lot of cans of air duster when cleaning computers, optical media, etc. The cheapest I can find are the Fellowes 'Air Duster' (1,1,1,2-Tetraflouroethane) for about $5 at Wal-Mart ...