I UPDATED THE DESIGN TO BE A TIGHTER FIT AND EASIER TO INSTALL. THEY’RE SLIGHTLY DIFFERENT FROM THE ONE IN THE INSTALLATION PHOTOS, BUT THE PARTS INSTALL THE SAME WAY AS BEFORE.
These two parts are designed to remove the play in the steering bar of the Challenge racing rig, where it connects to the seat frame.
One part is a bushing that goes around the outside and one part is a plug that is a better fit inside the tube than the stock tube.
The bushing has a hole on the underside which can be used to lock it in place with M4 screws or set screws if it’s a loose fit. Assorted screws via my affiliate link at Bangood: