I followed Erik's instructions for the two springs. The Item Type is a pull down.
When I use 40, all the springs are included. Since I only have two springs, and the results plot Maximum and Minimum Values, I get two lines on the plot (after I uncheck the Average), so that works, but when you have 3 or more springs, you may want to select Element IDs.
Here is the Force vs Min. Displacement.
I don't know how to obtain the spring element IDs in Mechanical, by graphical picking. You can see in the image below, I have the Element filter selected and can obtain the Element ID of the beam elements. I selected one beam element, highlighted in green and in the bottom edge of the screen, it shows that is element 34. But I can't pick the spring to find this out.
In the Spring Details window, I can name the spring and I have given the springs two different names: Gap1 and Gap2.
I don't know how to use the Gap1 APDL name with the User Defined Result.
I can open the ds.dat file and find the Element ID, which is a workaround for not finding it inside Mechanical.