DX4C Steering wheel replacements

The foam on my stock wheel fell off so I was having troubles turning it without my fingers slipping. So I designed this to replace the stock one. The smooth one was my first iteration, as a proof of concept, to make sure it would fit. Then, I made the one with 12 round ridges with to see if that would solve my issue. It sort of did, but i found there was too much space between the ridges, so I made version 3. This one works much better in my hands and I was able to make a thumb steer attachment