Mis-aligned beaks in Macaws (scissor beak)

Today I'm going to take a quick break from clicker training and write a bit about scissor beak in macaws. Hand-fed macaws should absolutely not suffer from scissor beak. Baby macaws my start to develop scissor beak (a lateral deviation of the upper beak) while being hand-fed. A trained eye can catch this malformation of the beak at a very early stage in the handfeeding process. Simple corrections can be made by triming or sanding the tomium (cutting edge of the lower beak) so that it is not wearing at an angle. If no corrections are made and the upper beak is allowed to continue to grow to the side the lower tomium will continue to angle downward towards the deviating side of the upper beak.  

Simple corrections can be made while the beak is still pliable, but if the beak is allowed to harden as seen above in this ten year old macaw, more difficult alterations must be attempted to controll and correct the problem. Can the problem be corrected at this stage in the birds life? I don't have the answere to that yet but am working with pictured macaw in my own attempts to do so.

Here in this picture the tomium has been ground flat in an attempt to alleviate the constant "push" of the upper beak (maxilla) to the side.

Here is my brave macaw "Sarge" after undergoing some corrective grinding of the lower beak.