In case anyone needs some fancy bits for your cyclekart, here is a dummy steering box.
STL files can be found on Thingiverse.
https://www.thingiverse.com/thing:6086083

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Instead of printing the body i used a peice of 73mm exhaust tube and a peice of 35mm tube for the gear tube.
Steering shaft is 18mm tube.
Pitman arm is on splines and can be set in an positioned.