[Zope] Locked Out

Greetings all, Having done a stupid thing and experimenting with user authentication, I have managed to lock myself out of the folder controlled by a PostgreSQL User Folder. I can access the top level (because it uses standard Zope authentication) but everytime I try to access the sub-folder with the above acl_users, it tells me it is forbidden. Is there a way for myself to bypass the lower-level security so as I can remove this acl_users folder and reinstate it. I've tried the Undo option to no avail. Any help would be greatly appreciated. Wade Pearce