Trust me...there is nothing a long armer doesn't try to get the waves out! As a long armer, I've had to quilt creases into a quilt before. I generally try to do it close to a seam if at all possible. Usually, it's the same customer that brings me wavy quilts. She is a friend and not that exact of a piecer. I just do the best I can, but can't seem to make her realize that her haphazardness is what results in folds in her borders.