Originally posted by kaseki I can't offer any help at the moment; I'm afraid of what might happen if I tried to duplicate your experience. I will observe that I am astounded that a lens element can even move with thumb pressure (relative to its barrel). Normally, lenses are located (fixed) by metal retainers and spacers. The glass would have to fracture to move.
Am I missing some aspect of your description?
Nope, as I recall I barely put little pressure on it, like I said my thumb slipped and pushed it. I was surprised as well.