by correct, he means that your gear mesh should be so tight that it sounds like its binding slightly when you spin it by hand. also take 1st spur gear off and be sure that the mesh is the same on the inside 2nd gear and look down from the top to be sure they are square.
my car always has a slight binding sound when the gears are new, they will wear in but they are not actually binding because they spin freely. you will know what I mean when you try it.