Ball Exchange Tile for Gravitrax

This is a GraviTrax tile designed to push out a pre-placed ball using the momentum of an incoming ball. The tile has a 10mm slope, and the incoming ball enters from the higher end.

Apparently, the speed of the incoming ball is important. 
If it's too fast, both balls will exit the tile. 

After dozens of revisions and subtle adjustments, I think I've created something reasonably user-friendly.

Rings here : https://www.printables.com/model/1149548-attach-rings-v12-for-swan_kikaku-models