How do I change the StayHear+ Sport tips?
Hold the earbud and gently grasp the attached StayHear+ Sport tip by its base and peel it away from the earbud. Then align the opening of the new tip with the earbud nozzle, rotate the tip onto the nozzle, and press the base until it clicks securely into place.
From the official Bose QuietComfort Ultra Earbuds manual, page 17
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