Originally Posted by
ItsJustMe
Why? I wouldn't think that another valve hole 180 degrees away would cause any real trouble. I've drilled mine out for schraeder, and even when I had the original total crap single walled rims drilled for schrader, riding on roads that are so rough that eventually I broke an axle, the cheapo rim never failed. With a good rim I wouldn't think this would really cause any trouble.
You're likely to screw up when you go to drill that hole. I certainly would be.
Besides, what to do if you decide to stop using that extra tube solution?