I have a JOYE510, just got it a few days ago. One of the attys that came with it holds the carts so tight it's breaking them. The one that came attached to the atty i had to use a pliers to get it off. Now while trying to switch off this cart i noticed it just broke like the first one. Does anyone know a special trick or anything to get the carts off? The other atty that came with is fine though and the carts come off/on no problem