Hi,
I solved the problem after contacting info@musikhof.de
This is an (the only?) service center for Electro Harmonix stuff and more.
It’s in Germany so probably you won’t have problem with delivery.
They provided me with 2 solutions: send to them the pog for the repair (too expensive for me due to delivery cost) or send to me the replace part. I choosed the second option and repaired by myself the pog.