Step 1: Cutting Out Slits
Now we need to cut out 2 slits on the cardboard on both sides .
(check out images to know where exactly )
Step 2: Stitching the Velcro Strips
now similarly do that on the 3 other slits .
Make sure you leave enough length for it so that it fits your head.
Now the Velcro strips have helped you to hold your phone tight and to mount it on your head.
Thanks and Happy Hacking !