MIRROR: Download from MEGA
Sorry you got ignored, there is just so much spam in the guest section (you would probably do better by registering).
They mostly push down at the front-middle, but it depends on size and placement. They're not really great for stopping sound- even with a perfect gag, one can make noises in their throat. But it'll definitely stop anything coherent.
Locking because this is so old. Hopefully this resolves your question and those of others.
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