Check to be sure that none of the ball and socket mounts have popped out.
This ball and socket mount has popped apart:
It's not unusual for the adjustment worm screws to get stripped at the ends when someone tries to forcibly adjust it too far. You should be able to pry forward on the lower adjustment slider while turning the 5mm hex drive get the worm screw to grab good threads.
A stripped worm screw adjuster:
Which hex drive are you using for vertical adjustment? The instructions in the manual are wrong. Lateral adjustment actually requires turning both, though the lower needs to be turned about 1.5x times as much as the top.
Threaded Mode
