Wedge for "Jumper T8SG Gimbel Protector Rotor Riot"

After print out this thing = https://www.thingiverse.com/thing:2764869 I realised that it won't stay attached to the transmitter by it's self, although it looks like it should (their are what appears to be spring loaded parts around the stick, but it doesn't grip anything), so I made this simple wedge to solve the issue.

It works well and is quick and easy to install.