Preferred Spreader End Corrosion Prevention?

[Robbie.g]

hi
i use what we buy as 'fender insert'.,it is a white thin-walled tube. We also use it to cover wire, in place of the plastic covered wire for lifelines , as here in nz; nz registered boats looking to go offshore and require cat.1 inspection, are not allowed 'normal' plastic covered wire.....
Not noticed any movement or loss of the isolators, like i said i hold the bits of tube in place with seizing wire over the tubing, and this seems to work.