I am doing an animated pop up card in Vegas

So I have 3 pages each on its own 3d track with a parent bin to control the 3child bins
So I move the swivel axis point to the edge of the page but i want the edge of the card so that it opens the page in 3d track of child but the shape of that track is not the same as png image
now I have to visually move the axis point to get the pages to line up

is their an easier way ?

thanks
Rory