If you put in in loose you should not see any gaps when you slide it in and out looking at the long ajustment slot from the outside. To see what I mean do it both ways and see the difference
I just had another look there and as you are looking in the end of the swing arm you can see top and bottom on the outher side of each leg where the the casting tabs have rubbed over the years from been taking in and out so it must be in right!