Originally Posted by
operator
That has nothing to do with it. If it's too slack then the capacity of the derailleur has been exceeded. Granted you can alleviate borderline capacity problems by using the b-tension screw in that fashion but it's really not what that screw was meant for.
I know that's not what it's meant for.
But if the springs in your derailleur are a bit shagged out and you keep dropping your chain, it's worth a shot.