Yeah, that happened to me on one of the sides too. Not a big deal especially if you cover it with electrical tape.I tried it almost the same way, but one part did not open, as you can see on the pictures here:
https://freshcuber.de/rubiks-clock-magnetisieren/
But that's not a big problem if you put the two sides together in the same position.
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If you like to give your clock a cool design, you can download (and modify) my templates here:
https://freshcuber.de/rolands-clock/
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