I just got a used 28-105 3.5-4.5 lens. It's about 3 years old and seems to be loose at the focus ring.
I'm trying to figure out if a screw inside is loose or a part broken.
Does anyone have taking apart instructions?
I already went to: http://www.photoscene.com/sw/tour/inside.htm
but it's not enough info regarding taking it apart.

