If I could go back to before I put the keel together, I would have put this wiring sleeve for the strobe lights wires in first.
Used some 1/8” tubing and snaked it down boom easily past bolts and was simple to fish out thru the hole at mast. The 1/2” sleeve follows it without difficulty and made the turn thru the hole.
There is a rubber grommet that goes over the sleeve and fits into the hole. Will complete this later when I know exactly where the wires go and connect up.