[Music in a bottle]

I just sold one of my Philco model 70 cathedrals, and noticed while packing it for shipping, that the tuning knob can be grasped and you can lift the whole tuning capacitor up and down about 3/4 of an inch! My other model 70, same thing! You cannot however move it side to side. Is that normal? I tried to see if the tuning capacitor was even attached, and it's hard to tell without tearing it apart a bit. Just curious about this strange finding.