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i use the lunette light flow cup and its great.
i often use a little aloe vera to help it up and in. I’ve only had trouble once when i didn’t push it up quite far enough, but otherwise, its the cup for me. ive never had to twist it, the cup seems to just open as its inserted. I use the C fold.
so, id suggest using lube maybe, or something to help with the rotation.
itsjustkelli on youtube has done a stack of reviews on cups and other devices. The reviews are a bit repetitive, but well worth it if you’re going to buy a new cup. She started with the Diva, but found others are better. Lots of details which really help, even if you skip to the end for the conclusion. (theyre long)