FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: device has spring ring member with lock and grooves, each accommodating an insert. Each groove is T-shaped in cross section of spring ring member and is formed by horizontal and vertical slots made on each of two open ends of spring ring member symmetrically relative to lock and asymmetrically relative to end faces of spring member. Insert is of T shaped corresponding to T-shaped groove. EFFECT: enlarged operating capabilities. 6 dwg
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