It comprises a rear part provided with a cylindrical body surrounding and clamping a sheath for receiving and protecting a driving cable. There is provided a lock for retaining the sheath at the opposite end thereof helped by a dust-coat. Rotation of the rear part makes said lock to be released through a spear. The sheath is provided with a cover inside of which a stranded wire bundle is disposed wherein a metal coil is arranged. Disassembling of the device is made by rotating the hood of the rear part and releasing the spear from the lock. There are also provided projections extending from the spear which may be transversely moved and either transversely compressed or expanded but never being released from the lock as the cable is rotated.