Does anyone know if it is feasible to reverse the side on which an existing sliding glass door opens? The door in question presently opens from the right; i.e., the right-hand panel is the innermost of the two panels and is the one which slides (to the left). The homeowner wants the door to open from the left instead. I hate to recomend installing a brand-new door if the arrangement of the present door can be reversed. Thanks for any advice.