For a brand new cart, it seems as if the sticker more often than not is adhered to the white mouthpiece. I have had good luck using a corkscrew to get the caps off. Now I am using a metal dental pick I got from Menards - it's hook-shaped at the end perfectly. I found that by trying to catch the clear o-ring prevents undue pressure on the white piece, and it works pretty slick - I haven't had a problem yet grabbing a wire (and there was only one cart that had the atty abnormally high where it could have been a problem - I am careful!)
At any rate, I have a clear fishing tackle case with all of my parts in it. I should try to get a pic up one of these days with my gear.
The carts aren't going to last forever, but with care, the mouthpiece and o-ring should last a while longer...