I just received a Brinly Disc Harrow it looks like it was hardly used. I noticed that it did not to be assembled right so I down loaded the manual. Going through the manual I found that the hitch was not put together right & that the disc angles are not right. One gang angle was set at 10 degrees & the other gang angle was set at 20 degrees Before any one makes a comment about reading manuals I learned a long time ago if you want to put something together properly it is best to become familiar with the instructions. Now for my question I found on one disc gang all blades will spin individually & the other gang the blades are locked together. Which is correct & does it make a difference?