This is a very easy project and only costs about 25 cents.
Step 1: Materials
1-Rubber band*Must fit tightly around lens focus adjustment
1-Screw(size is up to your preference)
1-Hot glue gun
Step 2: Get a rubber band
Try to find the thickest one you can.
It must be tight around the focus ring on your camera lens.
Step 3: Insert screw and glue
Then, insert your screw through the hole and glue it in place.
Make sure to glue the bottom of the screw so you dont scratch your lens.