Hello, I need help from GammaTech or anyone else that might know about the markings on the tension bar of the Gamma X-2 machine. I read the manual and it says that you use both weights for tensions between 20 and 90 lbs. I gather you use the marking on the tension bar that goes from 20 to 90. The manual also said you can just use the smaller weight for tensions between 8 and 20. There are 2 other markings on the tension bar where one goes from 4 to 12 and the other goes from 10 to 40 My questions are, 1. Which of the 3 markings do I use with just the smaller weight ? 2. Are all 3 markings in lbs or something else? 3. When would you use the other 2 markings? Thanks for any help as it is driving me crazy trying to figure it out.