I re-stitched that keychain of Captain Marvel's symbol, but this time I reduced the pattern by one row/column all around, used that space to finish the edge with nun's stitch, and then just trimmed it and popped it into the keychain. This worked much better than folding over the back, cramming the too-thick fabric inside, and supergluing the back shut.
Full photos and pattern remain at the Google Photos album, but I will try to embed the comparison pictures behind the cut:
( tall images )
And that is how I learned that superglue dries cloudy and visible on acrylic. (Reposted for poll.)
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+1 (thumbs-up, I see you, etc.)?