If the outer will still fit properly into the shifter body with the ferrule on it, use it. The more of a solid end you can give to the outer the better, otherwise some of the effort you are puting in when pulling the lever (shifter) is wasted through crushing the soft plastic of the outer cable
If the outer will still fit properly into the shifter body with the ferrule on it, use it. The more of a solid end you can give to the outer the better, otherwise some of the effort you are puting in when pulling the lever (shifter) is wasted through crushing the soft plastic of the outer cable