The rear hatch does not lock down when I close the lid. The handle will twist and lock but the hatch lid itself doesn't seat down flat. I need to take my hand and pound it down flat.
Twist and seal hatches do not need to seat flat to properly seal. The O-Ring is within a large Cylinder and not forced to seat between two flat surfaces just to get it sealed.
This is simply a cosmetic situation. Give it a tap if you want it flush, but not necessary.
Be sure you use silicone base lubricant. Oil based lubes will swell and damage the O-Ring.http://www.hobiecat.com/forums/viewtopic.php?f=11&t=38121&p=155356&hilit=twist+and+seal#p155356