This is a mod to hard mount the bed on an Ender 2. The original springs is too soft. Most strong spring are too long and silicon is supposed to change form over time so I think hard mount is better.

Requirements:
3 Nylock nuts M4 (or normal nuts + Loctite)
3 Nuts M4
3 Washers M4 (preferable with a little large outer diameter than standard)
Some plastic material between washer and hotbed for safety reasons. I put some old build surface sticker on the washers but Kapton tape is probably preferable since the build surface might get compressed over time.
Tipp-EX or other paint for the wheel cogs.
Glue to secure the nuts in the wheels.

One full rotation = 0.7mm
One cog rotation = 0.7/28=0.025mm