Yeah that happens … it just appears and if I don’t do anything with it … it will go away as fast as it came.
Was just thinking that it’s good to use a rubber no-slip pad as the base of your workspace. More than once have I been removing a tight screw on the outside of the camera when it slips due to the force I was putting on the screw driver, and it end up scratching the body. That sucks as you cannot fix that.
There was another one, but I think I have forgotten what it was … see, I waited too long.
This Old Camera 