Geocache - Drain Pipe

There's no question that I could've used a normal nano cache here but magnetic nanos are just REALLY boring. The manager of the museum where I wanted to place the cache seemed interested in having something a bit different within their grounds so I ran with it!

This cache is able to hold a small RITR log book and a short pencil. The nominal hole diameter is 83mm. The black spacers can be used to fit the cache onto drain pipes of slightly different sizes. I had to use one 3mm spacer and the ca