My Nano Rand v1 button is stuck.

The Nano Rand v1’s button can get stuck on tiptop z rails, or any rails that have the added lip.

This can be fixed by filing the bottom of the button down so that it doesn't catch on the rail. We can also perform this mod for you, if you are not comfortable doing it yourself.

You'll need a hobbyist hand file set like this:
https://www.amazon.com/General-Tools-707475-Pattern-12-Piece/dp/B000OCRK16/ref=sr_1_1?ie=UTF8&qid=1466094657&sr=8-1&keywords=hobbyist+hand+file+set

It's also good to have a hand file cleaning brush, as a lot of plastic will get stuck in the grooves:
https://www.amazon.com/Stanley-Tools-22-339-File-Cleaner/dp/B004EBMZTK/ref=sr_1_1?ie=UTF8&qid=1466094726&sr=8-1&keywords=hand+file+cleaner

Here is a photo showing the bottom of the Nano Rand's button (the Nano Rand is upside down in the photo).

File the black plastic off of the bottom of the button until the white plastic begins to surface.

Once the white plastic has surfaced, file a little bit at a time until the Nano Rand button is easily pushed when mounted.