Our mine vehicles get a very hard time, this is one of the items that is broken often enough. I have designed a direct replacement with a reinforced knob to hopefully not break again. I have just printed these from PLA+ and so far they have lasted months.
Only a small amount of supports required where the head of the machine screw sits.
It attaches the same way as the OEM part, you can just use the original retaining clip.
Hardware required is a M4x25mm machine screw and corresponding nut.
The author marked this model as their own original creation.