Top hung window winders

[Biko]

I have top hinged metal windows, which have WHITCO winders ('chain' type). These have become stiff. What’s the best way of lubricating them (there is no lube nipple on the winder) and what with please? Thanks Biko

[johnc]

I've used graphite grease with some success. Have also pulled others apart, soaked, cleaned and re greased and everything worked fine.