The perfect scarf can be done with the piece you�need the scarf on sandwiched between two other sacrificial pieces the same thickness. They need to be clamped equal distance apart. I'm pretty good with a good sharp low angle block plane but a belt sander works well. Here's the secret. Get the job 90% done and finish it with the pad sander with 100 grit. It's a bit slower than the belt sander and you can fine tune those layer stripes so they are perfectly�parallel.

If your searching for perfection, you want the sandwich to be the same wood so the cutting device is not riding on a harder surface anywhere. I clamp my 3 piece sandwich so the bottom layer is at the edge of a table or scrap of plywood.

All of this theory is good, but for most scarfs once you get it down a bit, I just put the plywood on the edge of a piece of plywood and use the plane and finish with the pad sander and get a damm good scarf using pencil lines for the length of the scarf.

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