Mercury - Quicksilver Trim Cylinder Bushing For MerCruiser Bravo I, II, III, X, XR & XZ Drives 807073. Overview. A smooth, responsive trim system can make or break how your boat handles. The Mercury 807073 Quicksilver Trim Cylinder Bushing is built to keep your MerCruiser Bravo sterndrive operating with that tight, confident feel you expect. It's a small part with an important job - reducing friction, keeping the pins aligned, and helping your trim cylinders move freely and quietly. Designed for