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This 3d view shows the locations
of the Sp!oids.
Note the 2x plates to the right
of the Sp!oids.
Cap off the K'NeX hubs with some
Sp!oids.
One more set of Sp!oids forms
the "stop".
A Sp!oids cap helps keep the hub
in place.
Add the catapult mechanism.
Connect up the rubber band and
you're ready to go!