It's just a 20mm tube?!!
Yes, yes it is. If you have z-probe sensor up and running, I highly recommend replacing your spring mount to this. This way, you remove the spring as a variable. The bed will be as level as the table your printer is sitting on.
You can adjust the height directly on your slicer. I made it 20mm because I have 10mm bed insulation on the way. I'd like a bit more clearance from the bracket.
Print 4 of this. ABS is ideal, or anything that can handle the maximum heat you plan for your prints.