Cool video, Rusty. The old Cockshut just a purring away...Ours sat inside what we called the "driveway" because one side was the corn crib, the other side was the feed bin with the hammermill and the blow pipe, the center was 14' or so wide where we drove through with the loads of corn to shovel into the corncrib.
In line with the pully was a planked opening in the wall to remove and roll the flat belt out through. We'd have to put a twist in the belt also. The center had barn doors on each end and when not picking corn, was storage for machinery or the old '56 Ford F250. We usually ground feed with a MH 44. I can still hear it and the mill singing their duet...just like your pair of performers !!!