A motion-transmitting remote control assembly (10) of the type for transmitting motion along a curved path by a flexible core element (20) movably supported in a conduit (12, 14) and adjustment means including inner (16) and outer (18) telescoping members for adjusting the length of the conduit. The assembly is characterized by a pair of identicle locking members (22) retained against axial movement by the outer member (18) and radially movable into a locked position in which the locking members (22) are in interlocking engagement with the outer member (18) and with one another so that each locking member (22) is in gripping engagement with substantially 180 degrees of the circumference of the inner member (16) to prevent relative axial movement between the inner (16) and outer (18) members. Each locking member (22) includes a male projection (26) defining a hook (28) for interlocking engagement with a flange (34) of the other locking member (22) sandwiched against a shoulder (30) of the outer member (16).