I'm considering adding key arm supports to my Mark VI alto. Maybe a double arm support on the low B like the Yanagisawas and/or the "helper bar" to ensure a tight close on the low B like I see on Yamaha Customs. Any thoughts? Is this a stupid idea? I would have one of the highly touted techs in the U.S. do it, so I don't think an incompetent tech would be a concern. I'm just wondering if you all think these mods help, or if it is just too dangerous for devaluation?