I just 3D printed the white piece for my 300D. There are a bunch of ideas posted last week here:
Fix A Fire Wall Throttle Linkage Pivot Bushing 84 300D
I was thinking of making a mold with my 3D printer and casting one like a skate wheel. One that uses cheap skate bearings 608z instead of plastic bushings.
There are a bunch of people already doing this on Etsy and eBay so I’m going to stick with my 3D printed “ball”. No need to add another product to the mix.
Edit - oh wait, Greg do you mean the black piece is broken? The white ball is trashed in your photo. Luckily all I needed was the ball part. Maybe two new urethane parts, ball + rectangular block need to be casted. I think there is some kind of primer that helps urethane mold making compound stick to steel. Come to think of it my black rectangle piece has some cracks.