Grinders work on concrete too btw. One of their main uses, aside from metalwork. The only way to lock it, would be to encase the entire thing in it (as in contacting the bottle) but I feel like that loses that charm of “a trapped bottle”.
The lid is plastic, saw the top of the lid diagonally down until the saw is stopped by the glass, tip the bottle over and empty it out. With no cap now you have reason to not finish the entire bottle.
Did you do this OP? Cause I’ve seen something similar as a joke Christmas gift. It doesn’t seem like a great way to stop someone drinking but it is might be a funny gift. Especially to someone who isn’t very handy and won’t be able to get through the casing.
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