This regular looking nut and bolt contains a hidden secret for Geocaching! Check out this Instructable to see what's inside...
Materials needed: Bolt and nut, glue, neodymium magnet, drill bits/drill press
Step 1: Drill Out a Hole in the Bolt
The first step requires the bolt to be drilled out, so you can make a large enough hole to fit a log sheet.
We used a grade 5 bolt because we found it to be softer than other materials. We started with a small drill bit and carefully drilled out a hole. We used several drill bits, each getting larger and larger until we had a hole large enough to fit a rolled up Geocache log sheet.
Check out the video to see how we did it!
Step 2: Glue a Strong Magnet in the Nut
The next step is much easier...simply glue a strong neodymium magnet into the nut. Use a magnet that fits nicely inside of the nut. We ended up using a 5/8" x 1/8" thick neodymium magnet for our nut, but could've even got a bit stronger. Maybe a 5/8" x 3/16" thick neodymium magnet!
Step 3: Hide Your Cache
Here's the really fun part---find an awesome spot to hide your new geocache!