Just wanted to thank you for posting this guide. I have just used it to fix a a very loud rattle on the passenger headrest of my GS250, it turned out both nuts had detached and where rattling around inside the headrest.
My question is now it is all back together properly how does the forward/backward adjustment mechanism actually work? The Headrest goes up and down but Im currently not sure how to adjust it any other way and the owners manual isn't clear. Mine is a 2013 F-Sport with the 15 way seats. Thanks.