For some time, I have wanted to easily center my print block on the paper while printing on my big letterpress. In an attempt to make this happen, I have cut some specialized lockup furniture that will accommodate my most common print block sizes. Now when I lock up my print, it will be centered in the chase opening. This will allow me to more easily and more quickly center my image on the paper. None of this was a problem when I printed primarily on an etching press. At that time, I could place my paper and block anywhere I wanted. With a floor model letterpress, all of this must be setup and locked in place before printing can begin.
This is what I came up with. It is made of MDF and color coded for easy use.