ProDo5 has a neat idea (https://www.thingiverse.com/thing:4206096 & https://www.thingiverse.com/thing:4129034) but I do not have a 25mm M3 screw or a M3 nylon nut. I do have couple of M3 standard nuts and couple of 12mm M3 hex screws. So modified model using 3D Builder (Came with Windows 10) and set up so screw goes through nut on each tab and then screws inward through rotation shaft and they approach each other on the inside.