You need a new AT cam arm.
Here is the deal. These older cams had holes drilled in the cam's at different locations to accept different trigger frames. There were two pins that set in these holes and oriented the AT arm to the correct location when firing.
What you need is a new 86 degree slider cam arm. I am not sure if cam arm was different on the the Slider vs. Hinge - but It doesn't make sense that it would be. Call CCM and see if they have a few in stock.
You can't flip the arm as the holes will not line up any more.