I had one come loose a few years ago. since it was a pretty nice SR post I decided to go the JB route. it seems to work OK, but that bike does not see much use.
I agee though just get a new post, especially if the top is really as loose as it looks in pic #2
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk