Outside Rear View Mirror Issue

Having an issue with the driver door outside mirror and figured I'm not the first guy to have the issue. It's on my 72 Demon avatar car.

The issue is it seems to flop around to an unusable position on hard launches. So you essentially have no outside mirror unless you constantly move it back into position.

It does not feel overly loose but won't stay where you put it with any somewhat hard launch. Does anybody have a way they've "tightened up" one of these mirrors? Need some sand in it or something in that ball swivel area!!

Thx!!

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