Gary,
I have this setup for about 8 months now with the only exception being I also relocated to the front of the left front tire and attached to the frame there. The sock as you said is visually cueing and when dirty put a new one on. I change mine every oil change. I modified mine with the sock because the relocating would still allow the vapors to go everywhere and the sock would catch the mist and still allow the bottle to breath. Good pictures.
I have this setup for about 8 months now with the only exception being I also relocated to the front of the left front tire and attached to the frame there. The sock as you said is visually cueing and when dirty put a new one on. I change mine every oil change. I modified mine with the sock because the relocating would still allow the vapors to go everywhere and the sock would catch the mist and still allow the bottle to breath. Good pictures.