Summary

Now you can let people know your disapproval without making an effort.

Not sure if hand held is best, or maybe it can attach directly to the car window to show everybody they are wrong, all at the same time.

Not printed one yet so the mechanics may need tuning. There is room for a counterbalance coin/washer as well.

Print with finger pointing up, support will help.
The 2 pieces should join together.
The first test at 70% scale is a bit top heavy so it will need the counterweight on the pendulum

Here's the Orchard link for anyone looking to improve the product.
https://3dorchard.com/app/single/587073873718e40c0498d0c7/5cbb5d2d6f542a0babb36750