Step 4: Tap the Shaft

Screw the tap in to the hole, use thread cutting oil, and only go a little bit at a time.
Screw it in then screw it out, little bits at a time.

Use the little bolt to check if you have gone far enough.
It only need to go in far enough to hold good.
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>https://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
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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