I went and had a look at mine.There is no stopper holding it from reaching the last tooth on the rack.
Maybe pull them out and clean the runners,they get clogged up with pizza crusts and womens underwear.
I cleaned mine up, oiled the runners and tightened up every bolt I could find.
I also tried to get the nylon bush for the reclining hinges as the old one was worn through.
No luck and was told a 6 week wait from Japan if Toyota can get one.
I ended up buying one that was close and honing it down till it fit
