rm /var/named/_default.nzd

In short, you have to nuke the zone database with the remote zone that says "HEY IM DA MASTA" when you have the local zone going "NUH UH, ME MASTER". This means you'll have to manually rebuild all the remote zones, tough shit. There is no other solution, as there's no safe way to actually putz with the binary version of _default.nzf. Seasoned BIND hands would tell you "well, don't do that in the first place". I would say, yes I agree. Don't use BIND in the first place.