I dropped my radio about a foot off the ground and the original volume knob just shattered into pieces. This led to me searching for a replacement part. I was shocked at the prices. (Not really, Motorola stuff is really expensive)
This led to me making my own part. I still had the plastic insert that acted as the key, so I built this model in fusion360 to interact with it. It sits tight enough it doesn't fall off, but can still be removed easily for replacement.
The author marked this model as their own original creation.