center spring strength in logitech 3d

i dont know if its this way with all ff sticks, but mine is really loose. if you pull it back it wont snap back into position real quick and tight like my older joystick. when i go into the screen where you can increase the center spring strenght, i couldn't believe what i found- there was no OK button! no way to save the things that you had changed. does anyone else have the 3d ff? could you shed some light on this, its really starting to annoy me.