Search:

But the actual tool:
https://www.amazon.com/WAGO-231-131-PUSHBUTTON-CLAMP-pieces/dp/B00LQPM0V0

I believe I just used an eyeglasses screwdriver... it was a little bit of a pain, but it worked.

Amazon sells everything... you could probably purchase a human being off Amazon if you were so inclined... (joking... sort of)
I'm trying to wean myself off Amazon to try and direct my $$$ towards...