I use a vacuum chuck quite a bit, with a Gast pump hooked up to the spindle port on my Robust AB. Right now, it's connected with 3/8" rubber compressed air hose and that works pretty well, but it's a little stiff and hard to manage when I move the headstock. I'm wondering if there's some alternative that is more flexible, thus more easily coiled up. My local Ace hdwe has some compressed-air hose that is definitely more flexible but I have my doubts about whether it will work or not. Holding pressure is one thing, holding vacuum is another - this stuff might collapse. Anyone have a suggestion for a more-flexible alternative to the standard rubber compressed air hose? Thanks.