[Zope] Really stupid acl_users mistake

I am quite new to Zope and have done something VERY stupid. I created an acl_users folder within an existing folder and added myself as a user. I did not however select either Manager or Owner and now cannot access the folder. Is there a way that I can either programmatically delete the user folder or change the permissions to allow access to this folder? I am the only current user on the system. Many thanks in advance. Marc Stein