Final Version! Should work!
The Raspbery Pi Cam V2 seems to have some issues with the focus.
Enhance Your cam!
The tiny wrench can be used to adjust the lens for better pictures.
This is the professional version,- made of steel.
Made 3 different shapes,- one of them should fit.
BIG 3D preview: https://www.shapeways.com/model/3dtools/4714052/1/23?key=3a48a42ec41cac466759384047538c45
Other designs & sizes on request.