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The answer is in your bowing action - the travel comes from your arm movement not being in a straight line each direction: there is a bias one way or the other. Usually the bias is in the direction that relieves the string overlap, in your case this is up the way, so you need to actively bias the other way slightly. I find it is easier to bias against an ...
This (Jetboil Crunchit Recycling Tool) was found by googling "crush isobutane fuel can" and reading this second result (right below the outoors.SE question) for the link.
Cheaper and easier solution. Attach your stove thingy (In my case, a pocket rocket). Open all the way and invert the can (away from flame sources obviously). Use a cheap and old fashioned church key to puncture the side. Total cost, approx. $0.50.
Wrap the string around the shaft in the opposite direction. Then it will tend to go down, but your uneven pushing and pulling will counteract it. If that doesn't work, try cutting a slot in the shaft and putting a keeper (such as a star washer) on it. You can also try this.
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