You could use pliers, you could very carefully hit the corners of the head in a clockwise direction with a hammer, you could spend a lot of time training the strength in your hand and arm to tighten it by hand, you could use a dremel, saw, or file to cut a slot into it and tighten it with a screwdriver
You know, I'm pretty certain at this point you're trolling, but I'm curious to hear how you justify this
If the reason something is broken is a loose or missing bolt, how does tightening that bolt with pliers instead of a wrench equate to breaking it further?
I made a solid effort to have a good faith discussion, and you came in with ridiculous claims that tightening a bolt with pliers instead of a wrench is somehow breaking a thing worse. Balls in your court now to defend that or else I can only assume that you're just looking to stir up shit.