Step 4: Metal work

Step 1:
Take the Aluminum sheet and print out the template 
Picture 1,2,3

Step 2:
Cut the bracket out of the aluminum sheet according to template using a metal saw and bend the bracket tab according to picture
Picture 4 and 5

Step 3:
Cut out the mount arm from the aluminum sheet
Picture 6

Step 4:
Cut holes into the mount arm (according to template) and attach the servo wheel to it using #3 bolts. Cut any excess bolt length after attaching a nut. 
Picture 7, 8