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Do we have any 3d modelers in the house?
I've had an idea on how to update the original leg parts.
I would seperate the upper and lower halves using the fake joint, then have one side have a half length technic pin molded into one side, and a half width technic hole on the other half.
And I think if modified right, this design could be used with literally any single peice bionicle arm/leg part.