I have been having some issues with Grovers not holding tune like they're supposed to (they seem crap tbh unless it's a problem with the guitar - but when I treat the grovers like standard tuners they seem okay... Except the E which changes its tuning depending on how hard I hit the string, WTF, but I digress...) so I was playing about with one of the offending ones, and it came apart, and I heard a little something metallic fall to the ground. I put it back together and wound the string, it no longer feels like the holes lock into place or grip or whatever, but it tuned up okay. After some frantic searching of the carpet I found a little ball bearing that I assume was what fell out of the tuner. How would I go about putting it back in?