Abstract: The present disclosure provides a device configured to be positioned within a prosthetic socket. The device includes a tether having a first end and a second end opposite the first end. The first end of the tether is configured to be coupled to a prosthetic liner. The device also includes a spool fixed with respect to the prosthetic socket. The second end of the tether is coupled to the spool. The device also includes a motor and a battery configured to provide power to the motor. The device also includes a coupling mechanism configured to transition from a first position in which the spool is only able to rotate in a first direction to a second position in which the spool is able to rotate in the first direction and a second direction. The device also includes a release actuator positioned on an exterior of the prosthetic socket. Actuation of the release actuator causes the coupling mechanism to transition from the first position to the second position.