DARTH SABER
Master Member
First I don't think screen caps of the Wampa cave scene are HD enough to determine the size/shape of the fasteners.
Also, I had another thought. Go back and re-watch the Wampa cave scene.
We know there were 2 different Lightsaber props used in the Wampa cave scene. We know there was a regular Hero prop, and we know there was a bladed Stunt prop.
How do we know this? We can see by going frame by frame that a non-bladed Hero goes from the snow to Luke's hand. Most likely Mark threw the saber from his hand into the snow and the footage was run in reverse to make the saber go the other direction (Lucas and the editors used this trick several times in the OT).
Second, we have set photos of Mark holding a partially bladed Stunt saber in the Wampa cave set.
Now, go back and watch the Wampa scene again. Notice that the saber in the snow is shown from 2 different angles: from Luke's point of view, and from the side (forth wall view).
When Luke goes to use the force to retrieve his Lightsaber the saber moves. Look at the movement. The saber goes 'back and forth' (front to back) yet the snow is not disturbed. This is true for both Luke's POV and the side POV.
The easiest way to get this movement is to use the BLADED STUNT SABER with the blade rod attached and have a crew member hold the end of the Stunt blade and jiggle the saber back and forth slightly and move it in the snow.
That's why the front of the saber is not visible. There is a Stunt blade attached. This makes the most sense and would have been the easiest to film.
I'm not sure the Lightsaber we see in the snow was actually the same hero Lightsaber we see on Luke's belt on Bespin.
The grips on the Wampa cave saber look somewhat worn and the top fin/edge of the grips look slightly shorter than the Hero saber seen on Bespin or in the ILM Luke Skywalker promotional images.
This may account for different fasteners being used. Plus the Wampa cave was not filed in Norway, it was a set built in England that could be the reason for the changes.
I think the Wampa cave Lightsaber was a Stunt and not a Hero.
Those are interesting theories but theories none the less.
What we do have is a screencap that clearly shoes a screw of some type witth tall bubble-like profile head shape which is far more common among screws than rivets.
As for the actual size that cannont be determined, only the profile shape of the head is what im discussing.