another hurricane hinge question

My hinge came with an aluminum bar. It's about 3/8 inch thick by the width of the hinge portion (I had meant to measure it to get an actual dimension, but that's probably close).....
I imagine this is used under the hinge section that goes on the roof to raise it up. Am I guessing correctly?
Is it used for some fine adjustment... if it were used it would kind of skew the entire hatch placement.....
Any thoughts on this would be helpful. Thanks!
John
I imagine this is used under the hinge section that goes on the roof to raise it up. Am I guessing correctly?
Is it used for some fine adjustment... if it were used it would kind of skew the entire hatch placement.....
Any thoughts on this would be helpful. Thanks!
John