Wow, never heard of copper tubing in a hydro steering system. But if you can't tell by now, I don't know much about hydro steering
I know enough about steering cables though including how much they cost and how dangerous they can be when they fail! I got real lucky 2 years ago when running about 30 mph with 6 folks on board she snapped and sent the V into an instant sharp right turn. Luckily I throttled down just in time as we were heading straight for a wooden seawall on the lake.
No one was thrown out but it was scary.