I tried all of these.

With the SpinFits specifically, those ones I cut just above the pink plastic part to glue into the Bose StayHear eartips. This works very well if you can glue it properly but since there really isn't any consistent or real way to do it, doing it properly is a crapshoot. Again, my left eartip is perfect and I've never had an issue. The right eartip is the one I didn't get quite right.

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