L1R1 button

Very simple (maybe a bit robust) design. I think no description is required for the assembling. I used double sided tape, aluminum foil and some electric tape at the screen to prevent scratches. Yes it works through electric tape, just use 1 layer only. I used a small spring but instead of that you can use a rubberband fixed to the hooks. For the shaft just use a paperclip and bend the ends so it won't fall out.
I am using it on my note 8 since 6 months and it works well (I use it daily to play a few matches) but with the adjusting screw you can put it on any other phone.
I did not make the left side yet, I just use it for shooting. Maybe if a lot of you is asking I will make it. (just need to mirror it somehow) Or if you make the mirroring, please send it to me and I will upload it here.

If you have any questions, just ask in the comment section.