Jolly,

If you have some older servos, as in before surface mount technology. The servo travel can be reversed. I am not near my notes. But as I recall on the old servos - you reverse the two wires that go to the “pot” and the two wires that go to the motor. That is what I did for the flaps on my “Wild Stik”.

This goes back to the days before servo reversing switches. You once could buy “reversed” servos. Man that goes back a while. As in early 80's and bottom end radios.

Of course the easy way is a servo reverser in line with your Y harness. HobbyKing has them reasonably priced.