To bludgeon my beef, I generally just ball up my fist and punch. Repeat till tender. I'll maybe hum "The Rye or the Kaiser" under my breath while doing so, and my meats are usually sufficiently softened as a result. This was all fine until I discovered the ultimate in faux-badass kitchen accessories. The Knuckle Pounder Meat Tenderizer!
Ever since I saw that little gem, I knew that I had to have one. But I wanted the option of using the brass knuckles again for another project or perhaps a good old-fashioned street rumble. Welding was out because A: It's permanent, B: I don't know how, and C: this project is too ridiculous to learn a new skill that requires specialized equipment.
Luckily, the dollar store sells this wooden meat tenderizer that might as well just be a beef massager. (I suspect that's what they use when Kobe cows* get their luxurious and sensual massages.) With some zip ties, a drill, a handsaw, and a lot of patience, I was able to put together a brass knuckle meat tenderizer that is both less practical and more expensive than the one I saw online.
*Right? It's not technically Kobe beef until they get butchered. Or until they start a fight with a Los Angeles Laker.