How to build a banshee claw

Im really stuck on trying to build a banshee I have looked at images but am stuck and just need help

Diagram:

_________
O      O

so essentially, the two Os are the rollers and the large chunk of underscores are plastic made to grasp the pins and cups when the roller pushed the piece into it, it gets stuck and is stuck there until the claw rolls it back out you also need to tension it so the flexwheels/rubberbands would grip the pins and cups properly

This video could probably help.

I kinda got that from looking at videos of the banshee but I still am stuck on it. Thank you for that diagram tho I’m going to see if I can make some progress on it today.