Hi

I'm still quite the newbie with SW(2017).  I am attempting to add some reference check-dimensions at the assembly layer.  One of my components in the assembly uses a machined pin with a "chisel" tip.  I'd like to be able to snap to the center of its face as it is a primary reference point for other pieces that tie in to this assembly.

I can't seem to find a way for SW to recognize the center of a "square" face.  Am I missing something?

I am attaching a picture of the assembly. The highlighted blue face is the square pin's face I need to center on.

Any tips?
Bill