New K'NEX Ball Machine Element - Trapdoor Arm

Hey everyone! I built this new K'NEX element the other day, thought I'd share it with you all! I call it the Trapdoor Arm. I have not featured it yet in one of my own ball machines, but the element works fully reliable as far as I know. I hope you all like it!

-XxdodoknexX-

PS. If anyone has the time: there might be a way to make this design stackable. Just an idea :)

Step 1: The Base Frame

Step 2: A Little Platform

Step 3: The Lower Half of the Arm

Step 4: Top Framework

Step 5: Entry Path + More Framework

Step 6: The Upper Half of the Arm

Step 7: Railing

Step 8: Done!