The Video Below is the result of combining three belts together to make 73 round for the entire belt.
As you can see, if you attach the belts in the correct way, it will run smoothly.
Step 1: What You Need:
-A small screw driver (the screws are tiny)
-An exacto-knife (any kind will do, it's a pretty simple cut that needs to be done)
Step 2: Unscrew the Second Belt's End-Piece
Take your screw driver and unscrew the two screws on the bottom of the green end-piece. Once you do that, take off the top plate, and it should look like the second image.
Step 3: Modify the First Belt
In case you have doubts (though I don't know why), This is the point of no return. This is where we remove the round so we can then attach it to the second belt. If you want to go back, just put the green piece together again and screw the screws back in.
Now, moving on:
-Look for a little lip that is on the side of the round. I pointed it out on the first image.
-There's also another one on the other side of the round, also shown in the second image.
Take your pliers and remove them. In doing to, the top part of the round should be removable now, much like i the third image. You can now take off the round and throw away the top portion. You now have a good amount of the belt showing, enough to attach to the second belt.
Step 4: Overlap the Belts
Take the first belt's black strap that you exposed in the step before, and place it over the end piece on the second one.
Now this is important: make sure the gap between the first belt's last round and the end piece are exactly the same as the other rounds. If you don't do this, the gun itself won't be able to catch onto it. (The second image is showing the gap that is needed)
Step 5: Combine the Belts
Since the spikes are small enough, simply press the black strap down into the end piece so the spike go through it.
After this, take your exacto-knife and cut a small hole for the lined piece that is to the left of the spikes (the second image shows you where it is).
Step 6: Close the Second Belt's End Piece
Next, Simply place the other piece of the second end-piece and press down, making sure the spikes went through the black strap. when it is in place, re-screw the screws.
Step 7: Finished!
You have completed what you need to do in order to combine the new versions of the Nerf Vulcan Belts! The next thing you would need to do is to find a way to make a new holder for the gun, which I'm currently working on, and I will give you a tutorial on that later when i get it.
Other than that, go out and enjoy your extra ammo!