Shoulder button for phones

Ive been wanting to play fps games on the phone and have a better experince, searched the interned but cant find stuff like this so i made it myself its not the most beautiful thing but it does the job fps games are much better with having a shoulder button.Button is not electric powered it just touches the screen with cable or alliminium foil.I'll try to make a secand shoulder button but for now you can print two and use it side by side.It should fit most of the phones but bear in mind i made i