The original wheel with two circles was not confortable to me, so I designed a real round wheel to be more comfortable and with a better grip.
Inspired by the steering wheel of 1967 Ford Mustang.
Updates
2024-03-06: With the sudden success of this piece, I decided to give it a little makeover by adding some colors: I uploaded two 3MF files (steering wheel + horn) with multicolor for those who have BambuLab's AMS.
1.6mm diameter metal rod X2 (butterfly paper clip/14 gauge finishing nail/wire)
Superglue
Instructions
Glue the top and bottom edge of the bearing into the frame. Wait for glue to dry. Superglue might leave a white haze on the controller if it's not dry.
Attach the pivot to the rack: Cut down a 14 gauge finishing nail to a length of 20 mm. Pass the nail up through the pivot and into the rack. The pivot should spin free on the nail with minimal play. Put a drop of superglue in the slotted part of the rack. This is probably the most ideal setup. A piece of paperclip [wire] works but it's tricky to get a tight bend on the end.
Snap the rack onto the frame: Attach the assembly to the controller. Start by sliding the pivot on to the left stick. Clip the back of the frame on, then the front.
Glue a 22mm length of metal rod into the "nub". Pass this down through the bearing and frame. There is a step in the nub, have this on the left side.
Press the wheel into the bearing and glue the horn on the rod.