I just saw this thread. Mostly because ive been desperate. Same issue. S pen started breaking off after about 2 months. And the clicking mechanism started to jam as well. Right now my s pen is stuck because the clicking mechanism is broken. No i did not insert the s pen backwards. Anyway, I've been resigned to the fact that i got to get myself a new one. Problem is im from the philippines and nobody sells them here. Going to samsung philippines in a few days and see what they can do but for now im pretty much screwed. 
