First, collect the parts needed to attach the Arduino UNO to the back plate of the Light Shield 7 case. Use three black oxide spacers, and three standoffs placed into the machined 4-40 holes in the case. The spacer will result in the threading on the standoffs being just long enough to reach the other side of the 1/8" thick aluminum and are necessary to avoid the threads sticking out of the back of the case. Next, place the arduino on the standoffs and attach using a plastic washer to protect the board, and the included 4-40 screws. Leave the screws loose in order to allow assembly of the cover.