I just took off my 70-200 mm lens. And Oh Dear… what did I almost miss?
All the screws holding the base on were loose, ready to fall out. All four of them!
Solution is simple: a screwdriver.
Disaster averted. It was ready to fall off!
I recommend you all feel your lenses for looseness at the base, and if they are a little loose, check the screws. In fact – check the screws anyway. Especially on the 70-200, but I shall now go check all my 7 lenses.
PS: photos taken with 1Dx at 32,000 ISO. Yes, 32000!