Yesterday, I received a new knitting machine tensioner of yarn for my Addi. And same of a Sentro, I am enchanted because he is permit adjustment with precision. The magnitude of tension is represented by a value ranging from 0 to 5, increasing progressively. And the same of a Sentro, it is necessary to adjust the tension according to the thickness of the yarn and if resistance is encountered when turning the knob, stop and you need adjust the tension. The installation, don't mask a counter , It screws under it while freeing up the space of the meter buttons. However, good lighting will help you see your meter well.
For example: I tried a Red Heart With love on my Addi 22, size of yarn: 4, medium, my best tension is 2 for this yarn. The knit it's beauty and stable.
If you need more information and the price of this tensioner, this is a link a Amazon: