Sony E to Pentax 67 adapter

Sony E to Pentax 67 adapter to mount Pentax Asahi 67 lenses on Sony camera. It also has the locking mechanism that uses spring from any cheap ball pen. 

To add spring to the locking mechanism:

1. Inset the spring into the round grove
2. Cut the spring so it would protrude about 5-8mm from the top of the groove
3. Use something flat to hold spring in place and glue the top part using super glue.
4. MAKE SURE NOT TO LOOK IN THE FLIGHT DIRECTION OF THE SPRING. YOU CAN HEART YOUR EYES (YOU'LL NEED THEM TO TAKE THE PICTURES  WITH THIS LENS). Maybe use safety squint or proper eye protection.