We wanted the porthole in the forward end of the cockpit well to be usable for light and ventilation, so we put the engine controls behind a Beckson porthole in the aft end of the cockpit well. The Beckson porthole allows the engine controls to be entirely waterproof in heavy going when filling the cockpit with water. We found that by using a barrel nut as the knob, we could even fit the engine kill cable in the panel, behind the Beckson portlight.
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