There is no Dagobah saber.
Here is the real deal. Listen up because Skater McGee doesn't repeat himself.
There is a saber in the LFL Archives that we all call the 'Skywalker Ranch Saber'. For years it was thought to be the saber used in the Dagobah scenes but that has been proven false.
In every scene of Luke's lightsaber hanging from his belt (not counting bladed stunt sabers) there is a 'Hero' saber that has very distinctive features:
1. The Linhof D-ring assembly is assembled 'upside-down' and is attached with RIVETS.
2. There are silver fasteners in the bottom notches in the grips.
3. There are no additional screws in the top of the grips.
4. There in a strip of 1/2" shiny silver tape on the Graflex Clamp.
5. It had a non-broken working clamp with a non-broken working lever.
6. The beer tab is missing.
7. There are 2 red buttons in the top, no glass eye.
8. The silver lines on the circuit board are opposite the clamp lever.
Here is a picture:
Now we do know that rivets were used at least for the d-ring:
Which brings us back to the 'Skywalker Ranch Saber'.
It has:
1. A 'correct' mounted Linhod D-ring with brass slotted head screws.
2. 6/32 phillips head screws in the notch in the lower grip.
3. Small 2mm slotted cheese-head screws in the top of the grips.
4. 1" Textured tape on the Graflex clamp.
5. A broken clamp held together with a brass slotted head screw.
6. A broken-off clamp lever held on with a brass slotted head screw.
7. Only one red button.
The MILLION DOLLAR question: Is the 'SRS' actually the 'Hero' saber rebuilt/fixed, or just another saber (stunt ?) that was also used on the film ? Considering that Rivets were used in the D-ring there is no reason to believe that they could not have been used in the grips as well, although there is no evidence currently pointing either way until more clear photos arrive.
So, which version do you want to make ? The version seen on screen, or the saber as it appears now ?