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It can be a faff but worth persevering. Theres a few instructions on youtube, this vid is pretty much same method I used. https://youtu.be/lHTy_n5SeNw
rhb-
The one I tried to make several times was this, it's supposedly more efficient (or something) but perhaps I'd have better luck with a normal one. Better drink this Guinness I've got sat on my shelf then!
frankenbike
This is clever, I'm going to try it. My problem with them is never being able to cram one can into the other though (even if I do the stretching thing with a full can)