English translation: quick snap or quick secure fastening (flap)
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Explanation: This is also a guess,but it reminds me of quick acting cleats for hatch covers on container vessels. Those cleats are also security fastenings. Their function is self-explanatory.
I know that hatch covers and their fastenings don't have anything to do with the subject question, but it's just an association really.
Sladjana Montenegro Local time: 14:33 Native speaker of: Serbian, German