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How stable is this when the top is fully opened? It looks as though it could be easily tipped.
Where on this planet is there still a working pay-phone?
I suppose, if one were to insert a smaller pill bottle half full of BBs, while the hot glue was still liquid, one could make a dead-fall hammer.
I wonder if "pretreating" the jar with Vaseline or cooking spray will help the jar breakaway faster?
Dead-blow hammers are great tools for removing dents from sheet metal, or when you need precise blows on softer woods without worrying about scuffs from a rebounding hammerhead.
Cheap and Easy Guide to Building a Private Telephone System
DIY PCB using Liquid Photoresist