I've got the Radio Shack model, works great on both wires and boards. It
comes with 2 tips, 1 small flame tip that I use for the wires and the
traditional needle tip for use on boards, terminals etc.
Well worth the 20$ investment.
Most of the small ones I've seen (and one I own) use a standard butane
cigarette lighter filling port, and you fill them from cans of butane
cigarette lighter fuel easily obtainable at most chain pharmacies.
I found some cans of butane that were made for use with some kind of
portable stoves that were the size and shape of large sized spray paint
cans. They held a lot more butane than the cigarette lighter refueling
cans so I bought a couple and lathe turned a nylon adaptor to let me
connect them to my little butane torch when it needed refilling.
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