is there a way that we can change the viewers in the post event to feed once it

is there a way that we can change the viewers in the post event to feed once it has already been created.

I have situation where the feeds have been created with no security on the viewers. So the older feeds that are created are accessible to all the users in the system. But subsequently there was a requirement which mandates that the feeds to be restricted. While the new feeds entries that are created works fine. I want to fix the older ones so that they also are visible to the right people.

Any thoughts/approach welcome!!

OriginalPostID-220712

OriginalPostID-220712