maya aim constraint

[sssslamin]

Hi I am trying to rig a hydraulic arm in maya and I am having problems with the aim constraint. when i apply the constraint it flips the object to be constrained 180 degrees in the wrong direction.

here is a picture of the behavior

http://i.imgur.com/1WMC8.png

and here is my project file.

Hydraulicproblem.mb

I have some experience modelling but this is the first thing I have ever tried to animate.
any info you could give me would be very helpful. thanks