Was very hesitant to try and remove my Chinese valve stems because my tires seemed a lot firmer than they actually were. Used the C-clamp method and everything went VERY smoothly and I also put Dyna-Beads in both tires while I was at it. Put them in through the valve stem with absolutely no problem. Finished everything in less than an hour! Not sure I see much difference with the Dyna-Beads but I didn't have much of a problem to start with. Literature says that they should increase life of tire and thats good enough for me!