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I saw one of these in the spy museum in DC and thought it was pretty awesome. 
Recently, I discovered you can buy these, and the commercial version probably holds
alot more then mine, but it is fun to make your own cold war spy gear.

This might not work very well if you carry it around in your briefcase or something,
but in the proper place the bolt is probably one of the best hiding places ever.

You only need a few things for this 
  1. Two bolts, one big one small
  2. Hack saw 
  3. Drill Press
  4. Tap and Die set
  5. High strength putty epoxy (PC7 works great).

It would be really cool if someone with more know how then I would make one of these that was a flash drive.

Step 1: Remove the head

With your hack saw remove the heads of both bolts.
Try to make the cuts as smooth as possible.

Use a file on the large bolt so the head and the shaft can be put back together flush.
This is not necessary on the small bolt.
wow
Where can I get PC7?
Any hardware store that sells epoxy should have it. <br>i got mine at Ace.
Now all we need is some secret messages to pass back and forth. Someone to tell us how to produce microdots could be good.
not sure how practical a usb hide-a-bolt would be.<br><br>Possibly for micro-sd cards, but the narrowest usb drive I have measures just over .552 inches. to fit that, you'd need to start with around 3/4&quot; bolt. I dunno about you, but that would look pretty conspicuous lying around any office computer I can think of.
Well, i was doing some pre-summer cleaning of my harddrive, and cam across THIS image.<br><br>http://www.instructables.com/files/orig/FD6/54H0/GOTSZ0Q0/FD654H0GOTSZ0Q0.jpg<br><br>Sadly, my comments/reply feature seems pretty buggy at the moment, otherwise i'd have put the image directly into the comment. :-(<br><br><br>This method DOES require a bottoming tap(or fancy lathe skills) but produces a most pleasant result. As an added benefit, it allows you to have a cavity up to 95% the base diameter of the threads(if you're very careful drilling/boring)<br><br>That SHOULD allow ytou to stash a thumbdrive(minus it's case) in any 3/4&quot; bolt.<br>A 5/8ths bolt with a long enough shank(thicker, non-threaded portion) should also work just fine.
Pure brilliance
brilliant<br>
Love it! Voted for it, hope you win.
This is great! I'm going to vote for you. I've seen one that's made out of a hollow D cell battery with a smaller battery inside to provide power, while still leaving enough room for a message. The bottom was unscrewed with a magnet. I like yours better, though. Well done!
I love stuff like this. Great idea. I have no idea what I would ever hide in it though.

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