I smacked the nut up against a trunk while mowing and half the thing fell off. So I made one in fusion to replace it. The original was a metallic nut 5/16 with an over molded wing nut. The one I printed is PLA with 5 external and 25% infill.
Threads were a bit tight but screwed on and became easier the more I used it.
The author marked this model as their own original creation.