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How to make a basic template for creating a diy reflector
Get your foam board.
You can usually find that at a nearby dollar store or a craft store. Measure out a 9 " x 12 " inch' sheet'.
Get a pencil and start measuring on the board. Draw a line 2.5 inches (6.4 cm) from one short side and another one 3 inches (7.6 cm) from the other short side.