I am officially lucky.
When you close your car door you need not only watch for your fingers but for your camera too...
I dented focus ring on my dp2m and realized it only after trying to use manual focus.
Fortunately for me there was no need to take whole camera apart.
Only four screws under sigma lens sticker and top part with thread comes out. You have to watch for two optical sensor which have to be pushed in body of lens and after that focusing ring slides out. Just bend it back in to shape very slightly and it worked! Yahoo!