Is there a way to tighten up the bottom of the driver and passenger seat to the top part of it? Mine is starting to vibrate and I've already tighten up the bolts to the floor. It seems loose even when the car isn't in motion. Also has anyone lubed the track to the seats for better movement? If so, with what?

 

Isn't there a bolt across the middle of the seat would tightening it up complete this task?