What is a Filler Plate?

QUESTION
I'm confused about Filler Plates. Why are they not required for my serger?

ANSWER
A Filler Plate is an insert for your sewing machine. It's used to fill in the space between your machine and the cutout in the tabletop. You'll use your Filler Plate when you're sewing at the flat bed level (middle lift position), the level used for most sewing. In this position the sewing surface of your machine will be level with the tabletop. HAKA’s Filler Plate is made to match your sewing furniture and is custom cut to fit around the free arm of your machine (you remove your machine’s tool/accessories box when using your Filler Plate).
What about the serger?
A Filler Plate is not required for the serger due to the serger’s shape - a serger can be positioned flush with the front and left edges of the machine cutout in your tabletop.