I got a flat the other day when the valve stem partially pulled out of the tube. The valve often rattles and I stopped a few miles from home and gave the ring nut a few turns to quiet things down. I think at 120 psi this maneuver (which I repeat once a week) ripped the valve right out after 1500 miles. This is the first flat with Armadillos, and you can't fault the tire! Anyway, has anyone tried double-nutting the valve stem with a nut on the inside? Is that more likely to cause problems? My rims have a medium-deep V. Any other bright ideas to stop the rattle? Does anyone leave the ring off their presta valves? What is that thing for anyway, as the air pressure will never let the valve move into the tire? Thanks.