Calibration nozzle

Heej, I just finished the build of the k8200 diy kit. Now i have a problem with the calibration of the extruder/nozzle. The nozzle will not move closer to the bed as 5mm. The z-axis is not coming more down. Can someone help me?

check the screw that hits the Z-endstop. This will adjust the height when the Z-axis should stop.

You may want to post a picture of the axis and motor.

got it already. .thanks