1. Place your ZEISS LWZ.3 on a ı at surface with the mount facing up and the serial number facing away from you.
The serial number is located at the side of the lens foot.
The serial number varies.
2. Remove the rear lens cap.
You can now see the mount.
If you are changing from any other mount than a PL mount,
skip step 3 since the electrical contact is not exposed on other mounts.
3. With a T3 torque wrench remove the 2 smaller and shorter torx screws which hold the electrical contact.