The washers are flimsy and flimsy and require too much maneuvering to turn the lid. Trust me, you can just go to Costco (or any other place that sells ThermoFlask items) and buy a new set of thermos flasks. It's not worth the frustration of messing around with these covers even if they were free. Based on the quality of the pucks I suspect they will soon become unusable.
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