Way only to get stress at end nodes

Hai,

I have second order tetra elements (C3D10M)

I need to record max principal stress (Mpa) in a part at different location.

I follow this steps:

I use replace selected - elements select few elements

in contour plots - max- show location 

Max principal stress shown, but sometimes max principal stress show in mid nodes. I want to record in end nodes.

to get stress at end node i need play with max limits until it covers end nodes.

Any other way only get stress at end nodes

Thank you.