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Cool!So why can't you have the spindle engaged? The friction should help form the material?Have you tried to form the metal against something soft ? I'm thinking styrofoam.
any tips where i can find these or similar couplings online? they doesnt have them here.also ... if you moved the place there you cut the bike forward and got a similar bike then you could possibly also build a side by side trike/tandem . bike lego!