created this phone mount designed to work with itrdc5's flat top t500rs ring, made with a little tab it slots into the top of the flat portion (reccomend using some doubled sided tape on each side just to secure it better and uses a generic stretchy phone mount clip i took from an old xbox controller phone mount, attached pic to show the exact style i took mine from, disassembled by peeling off the lower rubber pad and unscrewing it, then a little hatch slides off the bottom of the clamp you then have to take out the pins on either side which keep it attached to the controller mount and allow it to swivel, you have to then drill a 2mm hole through the existing screw hole that goes all the way though the phone clamp and the little hatch that slides off then using an M2 cap head screw insert it into the existing screw hole and the new hole in the back and screw it down into the 3d printed part, being only secured with a single screw the phone clamp can rotate a bit so if thats an issue i suggest maybe putting some double sided tape under it aswell or maybe squirting some hotglue around the bottom to prevent that