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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. If you contact the manufacturer they will replace parts like that for free under the limited lifetime warranty. I would also recommend when replacing the cartridge to use some silicone grease on the cartridge to help lubricate it. Be sure to use plumber's grease or silicone grease and not any petroleum products like Vaseline (petroleum jelly).
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