mpow(r) angle increase bracket.

This is a bracket that you slip over an MPOW(r) phone holder for cars.
(https://www.xmpow.com/soporte-movil-coche-magnetico-de-2-unidades-para-rejillas-del-aire-de-coche-mpow-grip-magic-car-mount-universal-con-iman-para-iphone-x-8-7-6-plus-6s-6-se-y-android-smartphone-samsung-huawei-xiaomi-gps-navegador.html)

Although you could use a bolt to secure the movable piece. I used a thin wire tie, folded the ends up and glued them. works fine. And i think the wire tie being a rectangle; helps hold the movable piece in place.