Just a matter of clarification: Are you talking about a soldering/brazing torch or a flashlight aka "torch", used for portable illumination?<br><br>I have one of those Radio Shack MicroNox torches - it uses butane and Nitrous (as the O2 source). Bought it in the early 70's, I believe. It's been useful on some tiny things until a few years ago when I got a teeny tiny litle torch that uses a disposable propane cylinder as fuel. When I run that torch on propylene instead of propane, it is quite hot enough to braze with - for example, brazing copper impellers together for miniature pumps (impeller diameter ~ US nickel). Previously I used the micronox torch for that sort of thing - and it runs thru the NO2 pretty fast.<br><br>As for a refillable butane pencil torch - I picked up a handful of those recently on close out at the local Harbor Freight store. Normally $6 US IIRC, they were on sale for $1.25 US Very touchy to adjust the flame on. The only use I see for those is to toss into the vehicle toolbox with some rosin-core solder wrapped around the barrel as a means to expediently solder a few wire connections.<br><br>There are larger hand torches that use butane that can be rather handy - piezeo ignition.