Tricky coveyor belt - Gravitrax compatible

This Gravitrax compatible double tile is inspired by an obstacle from the classical toy Screwball Scramble.  It requires a little dexterity to get the timing right in order for the ball to pass smoothly.

Aside from the printed parts, it uses two extension springs. The one that I used (which I had laying around) were 0.45 * 5 * 10mm. The closest match from the Maker's Supply is BA005. These should work just fine, but I haven't actually tested with them.

To assemble:

• connect each spring to the base by pushing it through the respective holes
• connect the other side of each spring to half of the conveyor belt
• slot both sides of the conveyor belt into the base
• add the button to the conveyor belt