When you don't have access to a hammer, you can use various common household items as substitutes, depending on the task you need to accomplish. Here are some alternatives:
Heavy object: Look for a heavy, flat object like a wrench, a large metal spoon, a thick book, or a small dumbbell. You can use the flat surface to strike or apply pressure to nails or other objects.
Rock or brick: Find a sturdy rock or brick with a flat surface and use it as an improvised hammer.
Rubber mallet: If you're concerned about damaging the surface or material you're working with, a rubber mallet can be a good substitute for a traditional hammer.
Back of a screwdriver: For light tasks, you can use the handle or the back of a screwdriver as a makeshift hammer.
Pliers: Some types of pliers, like slip-joint pliers or lineman's pliers, have a flat and sturdy gripping surface that can be used for light hammering.
Wrench: Similar to pliers, certain types of wrenches can be used as a makeshift hammer, especially the ones with larger flat surfaces.
Wooden dowel or wooden spoon handle: For delicate tasks or when you need more control, a wooden dowel or a sturdy wooden spoon handle can be used to tap objects gently.
Remember that improvised tools might not be as effective as the real thing and could potentially damage the tool or the material you're working on. Always prioritize safety and, if possible, try to obtain the proper tool for the job.