I was told there used to be an article online documenting exactly how to fix the vibration issue in this manner, but the article may now be gone (or at least, m

I was told there used to be an article online documenting exactly how to fix the vibration issue in this manner, but the article may now be gone (or at least, my friend doesn't know where it is anymore). So it seems extremely likely that it is just a vibration shim.