Messed up "Google play services". How to reinstall them? I accidentally deleted my phone's Google Play Services app. So now, when I try to download apps on the Play Store, it says "No devices installed", and every time I try to install Google Play Services, it wont allow me to.

Can you help me? I've tried just about everything, and it still won't allow me to download anything. How would I get Google Play Services back working again?
If you are rooted with custom recovery installed, flash new Google-apps package from OpenGapps which would reinstall the entire Google apps with framework and Play Services.