Something that can cut wood
Step 1: Cut a Rectangular Piece of Wood at 4 3/8 by 8 1/2 Inches by 3/4 Thick. (Baseboard)
(Dimensions don't have to be exact)
Step 2: Cut a Smaller Piece of Wood at 4 3/8 by 1 1/4 by 1/4 Inch Thick. (End-board)
Step 3: Cut a 2 by 4 Inch Piece of Wood at 45 Degrees. the Result Should End Up Looking Like a Right Triangle.
Step 4: Take Your Wood Glue and And Glue the End-board Down to the Edge of the Baseboard.
After you glue it down, clamp it down. -
Step 5: Position the Triangle Board.
Put your phone against the end-board and slide the triangle board under your phone. Take your pencil and draw a line where the front of the triangle board needs to go. Then you need to center the triangle board. You can do that by taking the width of the baseboard and cutting that in half and mark the center with your pencil.
Step 6: Glue the Triangle Board Down
Set your triangle board where you want it to go and take your pencil and trace around the triangle board. Once you have traced it, you take your wood glue and fill the traced area and hold the triangle board down until it gets stuck. Let everything dry for half an hour.