Instructables

Cold War Dead Drop Bolt

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Step 4: Tap the Shaft

Picture of Tap the Shaft
14 check tap.JPG
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.
 
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