I was doing a shoot the other day and disconnected my camera from the tripod and loosened up the knob that tightens down the ballhead.
Don't do that.
The knob backed out and was never to be found after hours of searching - leaving me with a flaccid ballhead. Forever. Or until I paid manfrotto a ridiculous price for a new one. Or so I thought.
My solution was to just go to the hardware store and get an M8 bolt that was long enough - the same size as the manfrotto one, but a much bigger PITA to use. I've since wrapped the head of the bolt in gaffer tape so I have a pseudo knob to grab onto.
So, before you put away those ballheads, make sure that they are clamped down securely or the bolt that tightens it up might back out on itself. Thankfully the solution is cheap - 90 cents plus tape, but a bit uglier than the stock manfrotto piece.
I have a 488rc2 for anyone who was wondering, it might be different on other models though.
It's the little knob with the arrow on it that says BALL LOCK, closest to you:
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