I think some of the earlier Windburners had a slight issue with the size of the pot cozy. If you contact Cascade Design they are very helpful, they sent a replacement cozy out for mine free of charge and in good time.
Yep, shave one of the lips on the inside of cup as Andypeak said. I went through the replacement cozy options from CD and as much as they were very helpful, after the 2nd replacement I gave up and went for the DIY option.
Don't push the cup on too far either. It moves the cozy up and it all jams.
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