Nice video, very clear.
May well not be the freewheel.
Remove freewheel, slip wheel back into bike, spin wheel.
Are the freewheel threads off center? That would indicate
either worn or loose hub bearing, perhaps with bent or
broken axle.
Although it is possible to have a poorly machined hub shell
or a defective freewheel, both are less likely than hub
bearing troubles.
--
Andrew Muzi
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Open every day since 1 April, 1971