The stem has pulled out of my JY8078-52L U680-S115701 Skyhawk.

I opened the watch and gently pushed the stem back in all the way. Sometimes I can pull it out slowly to the 1st click and rotate the mode dial, but when I go to the 2nd position it will fall out completely.

I tried to gently push a pin into the designated hole that “releases” the stem, while inserting the stem, but it doesn’t do anything and I can’t feel it moving at all.

Any help would be greatly appreciated.