Hi, Just got my first set of labella low tension flats and they have little numbered cubes on each string at the ball end. A quick google brought up some suggestions from the talkbass forum that you take these off, however when I put them in the ferrule and apply tension the cubes allow the string to rotate freely. When I take them off they don’t rotate easily, so I’m thinking that actually leaving them on may help prevent the strings getting twisted when I wind them onto the tuning pe