Have never had a posh 5 or 6 speed freewheel. Usual with mistreatment is that the freewheel mechanisms rust and become solid. Or getting lumpy or sticky pawls so don't freewheel smoothly.
Here is the Sheldon brown page on how to take a freewheel apart https://www.sheldonbrown.com/rebuild-freewheel.html
@lynx started
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Have never had a posh 5 or 6 speed freewheel. Usual with mistreatment is that the freewheel mechanisms rust and become solid. Or getting lumpy or sticky pawls so don't freewheel smoothly.
Here is the Sheldon brown page on how to take a freewheel apart https://www.sheldonbrown.com/rebuild-freewheel.html