Mercury - Side Mount Mechanical Control Box, Non-Trim Mechanical Throttle and Shift Control 8M0103451. Overview. This is a straightforward side mount mechanical control built for smaller Mercury FourStroke outboards that don't use power trim. It's the kind of control you install once and then forget about because it just works. The non-trim handle keeps things simple, clean, and predictable at the helm. Ideal for skiffs, tiller conversions, and compact consoles where reliability matters more tha