Now that X Metals are being discontinued, I'm sure the tune ups and spare parts will eventually disappear as well. I have a few pairs of Half X. I take good care of them, and can remove the spring hinges and put them back together, change lenses and make adjustments with no problem. They are not as intricate as other X Metals, but is there something that will eventually wear out and need to be replaced? The rubber bits still look like new, and I don't really change lenses as I have a separate pair for each color. Oakley won't sell the torx screws. Is there an aftermarket screw I can stock up on? It seems to be the weak point of the line.