Assume you know name of company that made the gadget. Try youtube.

Lisle makes a gadget like this for burping the system. Many videos on YT. Here's one:

https://www.youtube.com/watch?v=-akD-7JD9x4

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"