It's funny you should bring this topic up Jin... I just checked my KD today and I too can only get the male ferrule in half way... but in Fiji, it slid in easily, all the way to just short of the epoxy???
I was just talking to Gav and he suggested honing the female part with fine steel wool. I have a little bit of knowledge of fly rod building and using sand paper on graphite rods is a really big no no. It might be safe to lightly sand a heavier GT rod... but it will be my absolute last resort.
Tanzania sounds like an awesome trip... you guys would have a blast! Just keep a close eye on Marco!