Does anyone know the thread size that I need to extract the pin in a hinge of a Dahon V-clamp?

I have a vigor but it should be the same as the Mu.

There is another thread about dismantling the hinge on the Mu in the mechanics forum, but the OP did not know the thread size and someone claimed it was M3.5, however I could not get M3.5x0.6 to engage the threats at all.

The hole itself has a minimum diameter of 2.9 mm so I tried an M3x0.5 and it would only turn two times before it stopped. So either the threat is not 0.5 or it is but the first two threads are damaged.

https://www.bikeforums.net/bicycle-mechanics/1293557-dahon-v-clamp-tear-down.html