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Mine were squeaking from under the rubber seal where the arms attach. I removed the arms(with difficulty), then popped off the rubber seals. It was all rusty. I then removed the circlip and spacer, cleaned and greased it. Packed grease into the rubber seal and refitted everything. No squeaking. I thought it was the rubbers on the screen as when lifted them it stopped but turned out not to be. Hope this helps.