How to mount and balance mirrors for spirograph project

Step 4 Tilt setting

To set mirror tilt insert small piece of thick paper into pocket under mirror.
Usually angle of tilt is very small so post card or business card works just fine.

And best thing is that you don't have to destroy your previous work in order to reset tilt ;-)

Remember, FS mirror requires gentle handling. Avoid touching it with bare fingers.
If you need to clean surface of front coated mirror use soapy water and soft cotton cloth.
Don't let water get into motor.
If you have heat gun dry mirror out with hot air. 

That's it.
Enjoy your new learned tips and play safe.