LED curtain jig

It's very hard to achieve exact gap between these [tiny and cheap neopixels] [1] without some kind of helping device. So I decided to make for my own purposes jig for soldering those tiny LED pixels. But after it was done, I thought that today I need gap between them with just this size, but maybe in the future I liked another numbers. So customizable jig was born. Maybe it helps somebody else too...

[1]:http://www.aliexpress.com/item/100x-WS2812B-LED-With-Heatsink-10mm-3mm-DC5V-5050-SMD-RGB-WS2811-IC-Built-in/32217074429.html