I use this only on the magsafe end. At the power unit end I use a different protector. I have fixed some very fine cable ties around the soft plastic part to keep things secure. It is a super protection and it works well. I have only one reservation - and that is that with the extra weight of the protector the magnetic adherence of the connector is reduced and it can become detached more easily. Nevertheless it is the best protector I have found. (It could be improved by having a small recess in the solid plastic part so that it slightly overlaps - and clips over - the aluminium of the connector. This would hold the protector more securely and prevent it twisting the cable).