What I'm doing here is shortening 18 bolts by about 3/16". Normally I'd just use my belt sander but this amount of material was easier to do here and it went much faster too. However, when I was through here, I did use my belt sander to deburr the ends.
 

Now that the bolts are done, it's time to work on the washers. I'm machining the outside diameter (OD) of all the washers to remove the galvanized coating. This is necessary because later I'll be using gun bluing on the bolts and washers and I'll need raw metal to work with. The washers are in the center and are shinny.
 

Once I had all the OD's machined, I needed to remove the plating from the flat surfaces. Here I'm using a magnet to hold the washer and then some 150 grip paper to scrape away the plating. This went pretty good but I wouldn't want to do a bunch this way.
 

I made this fixture out of a bolt to deburr the OD of the washers. The washer goes on the top piece, then the aluminum spacer is next, the washer I need to deburr, another aluminum spacer, and last is a washer and nut to hold everything nice and tight.
 

Now that all the metal pieces have been machined, it's time to use some gun bluing to make them all black in color.
 

The first step is the cleaner. The dish on the right has the cleaner in it and the larger dish has water. I used tweezers to hold each bolt while I swished it around in the cleaner. Then I dropped each one into the water, and then onto the towel to dry them.

Once they were all clean and dry, I put the gun bluing in the smaller dish and repeated the process. For the gun bluing, I counted to 30 and then placed them in the water to neutralize the chemicals.
 

I used the swab from above to apply the gun bluing to this larger piece. Then I rinsed it outside using the hose. I did one side at a time which is exactly how I did the wedding present. And last I lightly went over the entire surface with some very fine steel wool before using some oil to protect the surface.