Ensure that all screws are in all the way without forcing.

Set the Lift-Off Distance (LOD) setting to 'High'

Snap the sensor lens in place by lining up the 2 pin holes.

Apply the provided battery adhesive on top of the sensor as shown.

If these steps prove ineffective, please contact me for a mouse shell replacement!

I work full time, please allow 48 hours for a response. Thank you!