I've witnessed some and heard about some. Its kind of my fear since I'm looking for one. I don't mind a small project on a many thousand dollar purchase, I just don't want to end up with some huge problem. A person is usually only allowed to dig just so deep checking something out when looking to buy. Not everyone wants you removing filters etc, nor do they want the associated mess either. I say finals are one of the worse things to deal with, especially if it won't move.
I appreciate all the good answers I get on this site.
I appreciate all the good answers I get on this site.