A locking mechanism to secure a wheelchair while transporting in a vehicle comprises a base with a guide channel adapted to accept a catch pin and has been secured to a wheelchair. The catch pin is guided into the channel by an angled portion of the base. A locking mechanism cooperates with a pivot plate to secure the catch pin within the guide channel. A release mechanism allows disengagement. The guide channel includes a deformation groove that allows the mechanism to operate even when the metal has been deformed through repeated use. Lips are also provided at critical locations to allow free rotation of the parts even when the metal is deformed due to use.