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Robert,
This message is going back to my 10F. As I previously said, the tension between the high speed and low speed is markedly different. They are not close. As I said in my last message, I checked the two step? motor pulley and it is to spec. Because I remembered that someone had wrapped what looked like strips of friction tape around one of the steps (probably the high speed step of the motor pulley) I suspect the two step? countershaft pulley might be the problem.

However, when I said the two step motor pulley is to spec that was not quite correct. There was a small difference that I cannot believe could be the problem. The low speed pulley of the two step motor pulley is about 0.091" larger in diameter at the low point of the pulley than the drawing in the files section. The drawing has 0.95". Mine measures 1.041". This is only 0.091" larger than the drawing dimension. The v-belt never touches the low point but it would affect the sides. It does not seem possible that this very small amount would make a noticeable difference in tension. In fact, the drawing may also be off due to measurement error.
Stan