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Need way to fill small air canisters (4-8oz) w/ bike pump

I've got a couple of older small CO2 canisters that I haven't used in a few years. I figured a good way to reuse them was to make a refillable canned air. The only problem is I don't have an air compressor. What I do have is a bike pump. Does anyone have any good ideas on how to (1) get air into the cylinder with the pump and (2) make some sort of release system, trigger or otherwise, to release it like canned air. I'm looking to use it to blow out electronics and the like. Yes I know about the moisture issue but not terribly concerned with it.

105
trebuchet03 says: Mar 30, 2007. 1:25 AM
Keep in mind that CO2 canisters (and canned air too) relies on the vapor pressure of the substance. That is, a great deal of the "air" or CO2 is stored in those canisters in its liquid form and boils off as the pressure drops. That's why you get generally even pressure until the can is completely empty (assuming the can stays at a constant temperature - which is doesn't) :)

That being said... here is one person's solution :)

http://www.potchky.com/project.php?p=5
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