Originally Posted by Irvin
Here is a better test. The string in crushed by the gripper more if there is more tension on the string. Take a weight tie it to a string and measure the weight of the weight. Then wrap the string around a diablo and see if it weighs less.
Just in case you want a preview of what you are going to see I just did that. A 10 lb weight weighs 10.63 lbs hung from a string and when I wrap the string around my diablo it weighs 10.69 lbs. I think the reason for the 0.06 lb difference is the weight was free to swing when I did not use the diablo and when I did the string touched the the bar the crank slides on and that little bit of friction caused the difference.
You guys are too funny. Go on run you own test.
without the diabolo, the gripper is bearing all the tension.
using the the diabolo, the diabolo bears the majority of the tension as the string tightens around the spool so the gripper doesn't need to clamp nearly as hard on the string to hold the string from slipping.