After not being able to get the cartridge from the old model (GP77005-RP) I decided to try this one. It fits my K-942 perfectly and is very easy to install. It also feels a lot smoother than the old model. The only thing I had to do was keep the overlay from the old build and reuse it as the new build doesn't seem to make the shell thinner.
Chums Original Cotton Eyewear Retainer - Adjustable Unisex Sunglasses Keeper (Standard-End)
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