joshk
Contributor
I use the rubber ones, which are simply large o-rings. You can either make o-rings yourself or order some from McMaster-Carr (Dash 323 if you like them small, 404 if you want them a bit thicker).
I don't find them effortless to slide but with a bit of practice they work just fine and are very cheap compared to the more manufactured steel varieties.
I don't find them effortless to slide but with a bit of practice they work just fine and are very cheap compared to the more manufactured steel varieties.