The other two tensions were entirely different from the two MW tensions. I don't know if I can post a pic yet or not. One was definitely not assembled the way it was intended. If you run across a non working tension it may be because someone didn't know what they were doing or were sloppy putting it back together. If you disassemble one like that and put it back like you got it you will not have any improvement.
In my second picture you can see one face plate has a post near the tension for thread to go around. The other face plate has no post. Thread goes around the plate that goes behind the tension disks.