Extrusion Calibration by Calipers

I needed to recalibrate my extruder steps and wanted to try the SublimeLayers method using calipers attached to the filament. My inexpensive calipers lacked a depth rod so I was unable to use the originally designed holder. They also have a goofy boss at the bottom that will not let them sit flat against a surface (It's the pair that you regret buying even though they were like $4 and you just hold on to hoping that there is something that you can use them for.. this is THAT!). Pretty much any 1