D4 diff fine tuning?

[dan_kitty]

hi, since using the new adjustable slipper the car has been great, the unit has helped me out a lot.

now i want to get the most out of my diffs, im still a little unclear on what is too loose and what is too tight?

When holding the spur gear and left rear wheel how much force is needed to turn the right wheel for correct diff action (with slipper locked tight)

or when building diff via booklet instructions with the outdrives held, its says just tight enough so gear doesn't move. should this be so it doesnt move with only a little force applied or to the point when you cant move it at all when giving it a mighty twist?

cheers in advance