x belt tensioner Anet A8 20-tooth

This is a x-axis belt tensioner, remixed from Anet A8 X-Axis Belt Tensioner by scrhall.

You need:
M3 nuts (4x)
M3x20 cylinder head screw (2x)
M3x30 screw (1x)
(they are all left from the Anet)

i use these 20 tooth pulleys:
https://www.amazon.de/gp/product/B01LCINVO0/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

and you need a longer GT2 timing belt. I ordered 1m from ebay.