Mercury - Gimbal Bearing Perma-Lube MC-1, R, MR, Alpha & Bravo Series Precision Steel Construction 879194A02. Overview. Any seasoned boater will tell you that the smoothest rides start with the parts you rarely see. The gimbal bearing is one of those quiet heroes-working nonstop, hidden deep in the transom, keeping your driveline aligned and your steering predictable. When it's doing its job, you feel a steady, confident connection between the engine and the water. When it's worn, the whole boat