Find Movie about Old Man fighting local gang leader

Old Man fighting local gang leader, old man uses clips on his wrists to hook his arms around gang leader during fight

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“Siege” (1978) (TV movie)

A black gang terrorizes a retirement home, and an old pensioner, played by actor Martin Balsam, makes a metalic device and with the help of it he catches the black gang leader. In this short promo clip on YouTube you can see Martin Balsam with the custom made metalic device/clip/clamp on his wrists: