Another example showing the difference in tube end length during filming of ANH...the left image showing how much longer the tube end is in a Death Star corridor scene versus the right image showing it is noticeably shorter. One can watch frame grabs from each of these scenes as Vader rotates his head to see that it is not an effect of angle, it is a real difference in length. At some point during the production it appears the left tube was shortened...
and the right was lengthened...
If these above two came from different scenes, note that these are two different angles. The problem with only posting closeup shots is that it abstracts the object from camera distance, perspective distortion, etc.
In the shot to the right, the mask is turned away from the camera such that the (wearer's) right cheek is obscured behind the nose. Further, you can't see the corner of the helmet/dome's flange. Thus you see more of the side of the right tube.
The shot on the left shows the head turned more towards the camera. Depending on the camera distance and how much the camera operator zoomed in, what you are seeing may be explained by foreshortening.
If the screen-used ANH was shortened during production, but that argument presumes it stayed that way. All descended castings should then have shortened tubes. But that is not the case. The TM has proper length tubes. The Corbis shots show the screenused ANH as having proper length.
The Tantive scene in ANH is supposed to have been shot last. We see the tubes in their proper length.
Above: The viewer's left, a.k.a. wearer's right tube is not cut, but due to camera distance and angle, the opposite tube is shorter appears shorter.
Again, the viewer's left, a.k.a. wearer's right tube is not cut, but due to camera distance and angle, the opposite tube is shorter appears shorter.
I realize your TD's tubes have been cut shorter so their surfaces are behind the surface of the mouth. At best, if you place tusks on them, the base of the tusks will be flush with the surface, unless too much has been cut, and then the theory would not hold. I'd encourage you to try recreating accurate tusks, then recreate the same photography distance and angle and see if you can reproduce the exact same look. Short of that, this will end up being a squabble over how to interpret images.
Any additional discussion is just a revamp of the 20+ page thread we'd discussed on The Prop Den. IIRC, nobody was convinced back then. I certainly hope the points others contributed were not overlooked or forgotten, then the saying applies: "If we don't learn from history...."
Thomas, I realize you really want to put the TD in prominence over all helmets owned in the fandom, and hope that there are features on the TD that no-one else has. But in ascertaining this, one cannot stretch the facts to fit a theory. A theory has to stretch to fit the facts.