Yeah a simple disclaimer may work, but I'd maybe have a lawyer look at it. If nothing else maybe the LLC to protect your personal estate from your business dealings. I don't think you'd ever have an issue man but like you said once lawyers get involved it wouldn't take much to drag you through the mud and if they could prove the brass was too weakened or whatever it could put you in a bad spot without some kind of protection.
A couple years ago I got started in making daisy chain ropes out of amsteel that everyone now loves to use on climbing sticks for hunting, sold a ton of them on facebook groups before realizing if one of those ever broke and a guy fell out of the tree I could be in a world of hurt from a liability standpoint. A few different guys jumped in and started actual businesses and websites making them so I pretty quickly faded away and stopped doing it, which was fine by me ... made enough that first year to completely overhaul my entire hunting gear and equipment so I was happy!