1963-66 top question

My 64 Val has the original factory manual top and may still have the factory plastic window too.
So I'm a little paranoid.
I know it's not required but I unzip the window and lay it in the well smoothly.
I lower the top but not all the way until I pull part of it toward the rear so it doesn't get pinched between the scissoring frame rails. I think just doing that additional step allows the top to be lowered an extra 2".