@wolfetan44, thanks friend.
@FraGGleR, yess I used ordinary heatshrink tube on top of my "special" thin sleeve. Actually it is very flexible, I used a "trick" to make the heatshrink more thin, more fit, and since its thin its more flexible. I used this method for all of my iem cables and its perfect ; ).
A wipe-down with acetone or something similar?