New Harry making loud squeaky noise

The new Numatic Harry it’s Hairobrush is randomly making loud squeaking noise. I cleared the inside but the noise still happens. Any experience please? Thanks.
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replying to CBowles, Iggy wrote: You'll have to remove the screws and wash it out, if nothing is obviously stuck in the spinning axles. After it's clean and dry should you add a single drop of household or sewing machine oil to assist further in lubrication and debris flushing. You may want to oil the wheel axles too, as a preventative measure.
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