Hello, I am currently planning on constructing an electromagnet. Its purpose is entirely for entertainment. I was hoping to make two of them that I could attach handles and switches to so they could be used for hanging/climbing underneath some random thing. If possible, it would be useful if they could hold up at least 300-400 pounds to make sure they don't fail if the person using them were to apply force the wrong way with some sort of accidental movement. I was just wondering what material of magnet wire, gauge of wire, and type of core should be used. I'm guessing some sort of soft iron core, but I'd like specifics if possible. As for the wire, I don't know enough about wire yet to figure it out without asking. And although I can probably figure the rest of the magnet out pretty easily myself, if you'd like to throw in some recommended amount of windings, radius of core, or amount of current I'd be happy to hear. Thank you for time.