Does anyone have an explanation as why the hand held bow scales generally read 3-5 pounds lower than the hanging scales used in most shops ? We just sold a new bow that was ordered as a 29-70. It came in around 67-68 pounds and the customer was told that acouple twists in the cable would give him 70 if he wanted it that high. He has a handheld scale that only shows the bow as being about 63 pounds and is not happy. He tied weight plates together that total 65 pounds and when he lifts them off the floor he gets 65 pounds. We checked our shop scales with a 5 gallon bucket of water that we weighed on certified scales and they were the same. The bow is shooting a 405 grain arrow at 276 right now so I don't feel the bow could only be 62-63 pounds. Anyway, that would mean that NONE of the 70 pound bows we have sold over the years was really 70 pounds! Everyone I have talked to agree that their handheld scales read low but noone can explain it ? Any ideas ??