Folgertech FT-6 EZ bed leveling system

03/2021 update: I have added the aftermarket red Ender knobs to the printer (direct swa) and orange anodized flat countersunk washers to the build. The washers are for centering the bed springs so that they can't freely move about at the base. Links can be added upon request. *this is a completed project. It is running successfully on my own printer and does not need any further refinement.* This is the system which I designed for EASY bed leveling for the massive and difficult FT-6 bed. It ditches the tiny knurled aluminum knobs, tiny M3 bolts and short springs and replaces them with M4 hardware, 20mm springs and large, labeled knobs. I found a need for this after leveling for the first time when I realized that there wasn't even enough spring travel to compensate for the 2mm of front-back warpage in my under-bed. I had to use washers under the rear springs. On top of that, the tiny knobs are absolutely awful for making adjustments and the fact that there are eight adds to the f