I thought I would take content from a post in my "build thread" and share it more broadly here.  I've been working to prepare almost all of the hardware for my 6/1971 240z for re-plating, and have learned some, improving my process along the way.  Here is some example hardware I ran through the process this week:  
 
	    
 
	These hose clamps are in pretty average condition after 50 years.  Note that the less rusty one has some common damage on the phillips head.  It has been mangled a bit.  Something I have learned is that you can restore most philips screws with this type of damage by tapping the area with a hammer.  I place the bottom end of the screw on the flat surface of my vise, and then use a hammer with a smooth face to tap on the top of the screw, working the metal back down where it belongs.  I chose this one as an example to show that even when mangled this badly, decent results can be achieved (more pics below). 
	 
	So, here is a description of the process.  
 
	
		Use these glass beads from Northern Tool and Equipment, important for size of grain, and bead blasting at 90 psi with a 1/8th inch nozzle to remove all rust, and to establish a consistent finish.  I use one of these baskets and find that putting a variety of hardware (big and small) is great for trapping the parts in place so I can blast them without them flying around too much.  For large parts, you don't need to use the basket, and you can then go back over them with the pressure at 50 psi to put a smoother finish on them.  This smoother finish allows "second stage prep" by hand with less work. 
	
	
		After glass bead blasting, all hardware (bolts, washers, nuts, screws and odd small bits) then goes straight to tumbling in one of these vibratory tumblers.  I now use a stainless steel media (bought from Southern Shine Tumblers on Facebook).  See pic below.  It consists of tiny little bits of stainless steel that are good at getting into tight spaces, like between threads, phillips head recesses, etc.  And I now use it dry.  I was using water and a bit of citric acid, but I think that is best for doing brass shell casings.  I was fighting keeping the parts from starting to oxidize/rust, and have found that the media works better and faster dry... to put a nice finish on the hardware.  Minumum time in the tumbler is about 2-3 hours.  You can add 2 to 3 times that and get an even nicer finish.
	
	
		For large parts that I can't tumble, I use a Dremel tool and the little wire wheel brush attachments after the glass bead blasting (first) step.  For final, more consistent finish, I follow that wire brushing by hand rubbing the large parts with #0000 fine steel wool.  It doesn't take a lot of work at that point by hand, but the combination of using the Dremel followed by fine steel wool by hand does end up taking some time.
	
	After hammer and top of vice on the screw head, then after glass bead blasting - with comparison to head that was not damaged, and lastly, close up of bead blasted texture:
 
	    
 
	 
 
	After tumbling, the hardware has a dark grey look to it.  After wiping with lacquer thinner, the repaired screw in the second and third picture here is notably lighter in color.
 
	    
 
	 
 
	Sanding the top of the screw briefly with 320 grit or 240 grit would have been a good idea before tumbling, as I see some surface imperfections, but the screw looks pretty good compared to its initial state.  Most of the screws I have done this to were not in as bad a starting point as this one.  
 
	 
 
	If you want to get the same media, send an email to Southern Shine Tumblers first to inquire on pricing and availability:  southernshinemedia1@gmail.com  They accept PayPal.