This is an X belt tensioner that does not require you to go out and buy a new length of belt like all the rest.
This upgrade was built to only use extra parts given with the Anet A8 kits

+Attach it to the back of the extruder carriage with two m3 x 18 screws.

+press one end of the belt into the belt holder with a flat head skew driver. I used a small flat head to spread the jaws on the holder then pushed the belt in. the fit is meant to be very tight!

+use a M3 x 30 screw and m3 nut to pull the two assemblies togeather

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