Originally Posted by
cannonride15
[MENTION=53108]dglevy[/MENTION], you can call it a product if you like (or market it!). I always cut a small piece of inner tube, punch a small hole in it and slip it over the presta valve before insertion into valve hole. Presto, no valve base problems with the sacrificial gasket in place! Guess you could (also?) deburr the valve hole, but I never have. Don't screw the retainer nut too tight!
I'm posting here b/c I thought it might be useful for others to have all the information in one thread.
I had yet another valve seat failure. I had tried a new setup--no retainer nut--but obviously that didn't work either. plus, it was unnerving watching the valve stem wiggle around as i put the chuck on it, so good riddance.
For the replacement, I followed the advice here above--a piece of old tube as a cushion, remembering to not overtighten the retainer nut. We'll see how it goes. I'm confident this will solve the problem, after, say, 4 or 5 failed valve seats. Thanks to all who contributed their ideas on this!