I bought these to fit some rear wheels for my bike and they work well. Don't feel cheap and retire even if you keep tweaking my build until they dial in. No complaints from me.
Pros
* Detailed dimensions: ball hole diameter 0.236 inch / 6 mm. M6 x 1.0 female thread connection, right hand. Overall size 1.65" x 0.79" x 0.43" / 42 x 20 x 11mm (H*D*T).