Start by cooking the rice and allow it to cool slightly.
Slice the Spam into 7 or 8 slices. Pan fry the slices with a tiny bit of oil until lightly browned on both sides.
Cook the beaten eggs like an omelet in a small frying pan. 2-3 batches may be necessary. Cut the omelets into rectangular Spam-sized pieces.
Assemble the Spam Musubi
On a cutting board, place 2 half sheets of nori with the shiny side down. Align the double musubi mold on the nori 1 inch above the bottom edge of the nori.
Fill the musubi mold with a half inch layer of rice and spread it out evenly.
Sprinkle some furikake over the rice.
Add a piece of egg and a slice of fried Spam on both sides. Liberally brush teriyaki sauce on the Spam.
Top it off with another half inch layer of rice.
Use the musubi press and firmly push down on all the layers until the rice is compact.
Carefully remove the musubi mold and cut down the middle with a wet knife to separate the 2 sides.
Fold the nori around the rice until the two ends meet. Wrap the Spam Musubi individually with plastic wrap.