I have seen a few designs like this, but I decided to build a quick design of my own.

I use these to quickly adjust all four corners of my build plate when leveling it off. Only thing missing is a way to lock them in place (working on ideas of that). This fixes my two main issues with leveling the platform; first the ease of adjusting the posts up and down with out tools, and second the tool wearing the posts were taking by using the pliers I was using.

I use these on my diabond Mendel90