Anycubic Kobra manual bed leveling knobs

Hey people! Many of Kobra users asked about possibility to add manual-bed level function. Most kits online are for not-threaded beds using M4 bolts - not suitable for Kobra. 
Therefore I modeled this simple knobs for it. It's using M3 bolts and nuts. 
Main use of this mod is to maximize bed flatness and help ABL working better.

List of additional parts you need:
-4x Springs/Silicone spacers (18mm works fine)
-4x Countersunk Hex M3x40mm
-4x Standard M3 Nut (2,15mm thickness, flat height 5,5mm)

Knobs assembly → “Knob V10” is designed for pressing M3 nut in a vise - i just prefer this over glue.
“Knob V2 Glue” have larger hole opening so you can fit nut with addition of glue. 
“Knob Lower..” - also using larger hole but with addition of thinner knob - more on that later:

CAUTION!
If you printed and mounted the knobs first check by hand if the bed have clearance. In mine i had to zip-tie cables and I moved Y-axis motor cable away.