How to plane a board wider than the planer knives

How to plane a wide board with my homemade thickness planer. In this woodworking video I use a simple trick to plane a board that is wider than the knives of the planer. I don’t get a perfect flatten board, but because I mainly use limited tools, this is good enough to me to make most of my woodworking projects. How to make a finger joints box from reclaimed wood: