Great tips. At the onset of explaining various causes of a squeak, Tom Silva says it can be alignment, either of the door-to-hinge, or hinge-to-hinge. Hmm, seems to me those two scenarios different than the case in the vid, that being singular hinge with the barrels out of alignment. So, the vid shows a great solution to fixing out of alignment barrels, but what about fixing doors with hinges out of alignment from each other, or hinges out of alighment on the door? How do you make that determinations, and what is the solution? thx