I did this a couple years ago on another site and alot liked it, with anything it will get some criticism, but was a simple way to clean old hardware and give it a out of box new look without the use of phosphate. It works great for the back yarder guy on a budget and to save and re use specific hard to find hardware. Im sure alot here know how to do it but im sure some do not so hope it can help a guy out somewhere. You need just a few items to do this a cup of motor oil, a propane torch, some pliers, wire wheel or blast cabinet. First our bolt Your going to want to clean it good, I bead blasted it but a wire wheel will look just fine After cleaning it good heat the bolt good with the torch After it is hot soak it in the oil Remove bolt from oil do not dry it and reheat one more time Soak the bolt while still hot one last time If you do not get the finish desired you might have not got the bolt hot enough the first time just repeat the process. Before and after New bolt upper our old lower I hope this can help a few out!!