thank you for your time and help; I have a quastion about Displacement:when I want to apply Displacement i.e. 4 mm what the different between this cases!!
1. apply Displacement (z=4) on one vertex
2. apply Displacement (z=4) on two verteces 
3. apply remote point (z=4) on one vertex
4. apply remote point (z=4) on two verteces 

where should I apply the displacement in my case?