Tried with bigger brass tubes. Outer tube has some extra space around it to allow for some error. Inner tube is also slightly bigger, hopefully it won't bend as easily as the previous one. It works much better. However with the extra space around, the layers don't stay as straight as the other one. But it stretches pretty nicely. I think I should try to make the distance between each layer smaller as currently it strethes almost too much. If the layers are more compact the difference between the original object and the stretched one will be more clear.
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