It could be due to my miserly choices at the LBS or it could be my wheel, but I have had several punctures right at the base of the valve stem.

I had written these off as cheap tubes, and moved on to a new one.

This time, I cleaned up some burrs on the valve stem hold and tried to smooth it up as much as possible - so we'll see how that goes.

My question is, (and I searched unsuccessfully for it already) "is it possible to patch a puncture at the very base of the valve stem?"

thanks in advance