Re: Aft Head Hose
The tube probably should have a bonding wire on it but I don't think that mine do. The ball valve at the bottom of the hose does have one.
Forget the vinegar. It won't do anything. Use Sew Clean. Here's the link to Bill Kinney's blog post about Sew Clean: https://fetchinketch.net/2017/12/26/a-crappy-problem-with-a-solution/
I was shocked to see how well it worked. Given the results Bill showed in that blog post it is now part of our preventative maintenance plan. I will likely switch to using food grade phosphoric acid as that is the main ingredients in Sew Clean and you can get it for much less than Sew Clean.
SM 440 Cara
Deale, MD USA