Can you make a dual direction servo run only one way?

[Supermario]

Ok guys, I have to man up...... I'm an idiot! And I post questions way to quick without doing my homework nowadays ...... There is no problem with the tailgate operation , never was. Just needed servo arm adjustment. To make a long story short, Izzy thought of everything! The anchor screw on the tailgate hits the arm and stays within range on box down and the tailgate opens and closes perfect!
I'm just glad I didn't do any damage in my time of haste and now very happy to say the trailer is done and ready for the show in less than two weeks time to get the loader ready now

Mario