QA, stands for "quick attach" the QA started with the 1X5 series tractors, earlier ones were "bolt on".
They say that the stamped pulleys won't "hold up" they will wear through and come apart. I have seen tillers set up with the stamped pulleys, but it is not recommended.
I'm not sure about the spring thing... I think at least one of my tillers is set up with the spring tensionor.
Please understand that I don't recommend such modifications.
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