Anet A6 bed leveling update

This was my first Anet A6 modification. It simplifies for me the precise levelling process a lot. I used still the original parts plus 4 M3 nuts and 4 toothed lock washers to fix the original screw at the hot bed. I drilled out the screw hole of the slider plate with 3mm. The spring is hold in place at the top by the nut and at the bottom with the printed spring retainer. The knurled wing nut holder is a little bit undersized in the opening for the spring nut. I heated the spring nut with a hot air gun and with a long screw in it (to avoid burning my fingers) and pressed it hot in the opening to get a strong connection between knurled nut holder and wing nut itself. I needed to shape a little bit of the Anet A6 frame - about 1/2 mm only where it stands inside of the working area of the bed - with my Dremel mill to grant a smooth pass through of the bed.