I want to recreate the brick layout in the well image below. Specifically, I want my bricks to perfectly mate end-to-end (in the image below, the bricks appear to be uniform size, each 1/8th the circumference of the well). I have attempted this in my blend file by creating the curved bricks using an array and curve modifier, and then repeating the pieces using an array modifier and rotating about an empty. My pieces are not uniformly separated and overlap in one spot (see the .blend file or the images below). Is there a way to achieve what i'm after using modifiers and Blender functions without perfectly measuring out the size of my pieces manually?
I tried using BlendExchange to upload the file but the page kept giving an upload error. I have resorted to uploading to Google Drive instead.