Actually I have the Volvo Penta variant of the Morse combined shifter and it terminates with a traditional twisted wire that can be extracted back through the jacket, cleaned, greased and pushed back in. But my experience with this arrangement on motorcycles and other equipment is that any crimp or corrosion in the outer jacket can kink, and unwind the twisted core and you are done. That could turn a short maintenance task into a weekend project. However there is another easier way to lube a cable by taking the top end loose, clamp a piece of tubing to it, fill with oil, clamp a shrader valve on the end and pump it up with air pressure. Drive the oil through the jacket and out the other end. Kind of a last ditch effort to salvage a cable before having to replace. I have had good luck with this on motorcycles, never tried it on that gnarly boat cable.