Mercury - Shift Detent MerCruiser Bravo Series Stainless Steel & Spring Assembly 8M0157700. Overview. If you've spent enough time running a Bravo sterndrive, you know how much you come to appreciate the small parts that make shifting feel smooth and predictable. The shift detent is one of those pieces most boaters never think about - until the day the control feels sloppy or the gear engagement loses its familiar "click." The Mercury Marine part 8M0157700 Shift Detent brings back that steady, co