After buy few different ball link pliers that was not working at all on my gliders (for tailplanes), I decided to build my own. I use it to plug or remove the ball link on the tailplane. It works like a charm.
To build your own ball link pliers, you just need a low price flat nose pliers, and with a mini drill, you grid a slot in one of the nose:
Then shorten the other nose by 5 mm.