The WR flex cable I use is stranded steel cable in a plastic housing. It is not Ny Rod. The brand I use is sullivan Golden flex and the longest is 48 inchs I think. It works well even in the wet evironment as the cable is not a tight fit in the housing and I shoot lube in before each outing. It has been the most reliable for me on a considerable number of ships. I would not try to splice the cable and housing instead its simple to just shorten the curve as it does not have to go all the way forward to the trailing edge.

John