I've read in
www.teclasters.com that opening some players the risk of break the earphone jack is big. Anyway when was mounted there was that risk too and the player survive (I really don't know how many were broken before one survive
)
I have open successfully my C260 and I learned that it have to be done without instruments... only by nails! going around from the earphone jack. If it get broken this can be fixed... that's something I've read too.
Come on Zak4!... at the end you will open it anyway so just be careful and proceed!
Let us now how this it ends.
Good luck!!