Thanks, it made me realise there was a rubber bung at the top that hid
one of the screws. On my locks it had been painted over and just looked
like a bump on the casting. Three faulty locks now dismanted, oiled and
working - two more to go.
Given you have to be *inside* the house to operate the window locks, why
have individual keys? They use keys rather than latches so they aren't
accessible by e.g. hooking coathangers through seals or smaller open
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