I was changing the grips on my irons and noticed there is some rust on the inside of my steel shafts (Titleist Tri-spec). Is this something that I should be concerned about? I have not noticed any lack of performance, but am a bit concern that the shafts may be weaker and might break over time. I can't do much beyond changing grips, so not sure what to do about this if anything. I am saving up for new irons, but not quite there yet.
Bill