Hi stringtechno, don't u mean to put the first weight @ 5.5kg and then the second one @ 7kg? Eitherway, I cud see that being less of a pain compared to adding/removin the big weight all the time. Wuts funny is I find people are gettin different tension readings with the small weight. For example, valentinas stated that his small weight @ the end of the bar was 11kg x 2.2 = 24.2. But when I put my weight on the end of the bar, my fish scale reads sumwhere in the mid 25lbs if I rmber correctly. And if I were to bring the weight all the way down to the bottom, I get a readin of close to 13lbs. So assumin to add the second badminton weight on, I wud get 13+13-10=16lbs on the lowest end and 25+25-10=40lbs on the high end. This range of 16-40lbs is acceptable to me b/c the lowest tension I've ever been asked to tension is 17lbs which for me, wud b a 16x18 tensionin so havin 16lbs min is perfect. I'm more concerned about the difference in readings from fish scale to fish scale in the calibration process. Without the ruler, I can only rely on the fish scale n use a sharpie marker to mark reference points accordingly. The difference between valentinas end of the bar reading of 24lbs reading vs my 25lbs reading tho is prob not trivial when we consider that badminton racquets are not so durable compared to tennis racquets. Things like frame distortion wud b much more noticeable on baddy racquets. I have measured the tension of the bar only n it reads 10lbs 4oz so I believe my fish scale can't b too far off in accuracy.