I used these. They are bulletproof.

LINK

You want the hidden version(91645551) that is adjustable from 0-2.5". The other version(91645552) I run are the 3 1/8-5 1/4". Use antiseize on the threads. Mine have been on for about 2 years and are still in flawless condition. Absolutely no rust, and you don't have to worry about rubber dryrotting or cracking on you.