Inspired by other designs, I bought some Dunlop squash balls to fit to my 2040 Bear-framed i3.
It turns out that the Dunlop balls are bigger in diameter than most so couldn't use existing designs. I also found that my frame isn't V-slot, so designed it for non-V-slot 2040 section.
Requires 8mm cap head 5mm diameter bolts.
The author marked this model as their own original creation.