Way to stop drinking
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The problem with this is that anyone capable of welding also has several grinders for cutting metal. Try concrete next time.
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 one time I tried cutting concrete with a grinder it cut through it like butter
Yeah, pretty much. Just use disks for concrete, not metal and it makes it all a cakewalk