Generic Phone holder

Generic phone holder. Either use groves in back to hold rubber bands or purchase Spiral springs from ali express.2.5mm(120 degrees), 15mm(6 laps ), 20mm - https://www.aliexpress.com/item/1005006816493381.html?spm=a2g0o.order_list.order_list_main.80.2adc1802IJSSOJ