Hello Steve. How are you? I just got a Kershaw TIzdp189 and I noticed when I squeeze the handle the lock bar goes all the way to the non locking side. the lock bar does have full contact with tang and using your lock test it does not move. Also, appears to have light stain on blade near edge kinda looks light dried oil stain. tired WD40 and Ballistoll to remove stain or film but no luck. Sorry, I can't post pictures.
RKH
RKH