Cistern weeping

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My wc cistern is fixed on the underside with a bolt and wing nut. The wing nut is damp and rusty. There is an occasional drip. Is there anything I can do to cure it?
 
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Most unlikely tightening the wing nuts will cure the weep unless it is a new install so yes it does sound like cistern off and replace the donut.
 
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Another possibility, although slim...
Do you get condensation on the bottom of the cistern?
One of mine gets a lot of condensation and finds the lowest point to drip off, which happens to be the bolt.
Though probably not as likely during this recent spell of warm weather.
 
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