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This article is compiled based on industry knowledge to help purchasers make more professional judgments.
For the handle of a 55 Series single casement window being difficult to turn, hinges making abnormal noises, and the window being hard to open and close, in most cases, it is a partial failure of the hardware components, not the entire window being scrapped. This article starts from the root cause of the faults, teaching you a three-step self-check to determine whether you can repair it yourself, under what circumstances you must replace parts, and the key parameters for selecting universal hardware, helping engineers and purchasers quickly troubleshoot issues and reduce after-sales costs.
