Transistor Checker Anti-Rock

I bought this Transistor Checker and every time I tried to use it the ZIF Socket would rock and most of the time fall out. This Anti-Rocker fits between the Transistor Checker and the ZIF socket and prevents it from rocking. I glued it to the ZIF Socket, it works great.

Note: This is not an endorsement for the Transistor Checker Pictured here, I created this to solve an irritating issue with it.