Step file for the shaft so you can have a metal part made or edit the part to your liking. This is set to have the top of the shaft threaded to M10

Shaft.step

Step file for the shaft so you can have a metal part made or edit the part to your liking

This is the part that will slide over the shifter rod and allow the attaching of different knobs. 
There are 3 screw holes. one at the top for a M3x16-20 screw to thread through the top of the shifter rod.
2x M4x4 grub screws that help locate this part to the shifter rod

The way this works is the top M3 screw will thread through the exposed plastic piece at the top of the stock shifter rod. You will then be able to pull up on this part along with whatever knob is attached to it to disengage the transmission to shift gears

Shaft.stl

Shaft V4.stl

Shifter knob that slides over the shaft part. Screws onto shaft

Knob Large.stl

Shifter knob that slides over the shaft part. Attaches to the shaft via m4 screws

Knob Large v3.stl

This attached to the shaft section using m4 screws. This version can allow a BMX rubber handle bar grip to slide over it.

Knob BMX.stl

Knob v1.stl

Knob Bar.stl

Knob Bar v1.stl

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Shaft.step

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