Beth Major-235285 (1/14/2011)
I figured it out. Turns out this is easy. Local admins on the server have sysadmin rights from sqlcmd when the database is in single-user mode. I was able to restore the master database using sqlcmd and Windows authentication.
or you could have re created the BUILTIN\Administrators login and put it back into sysadmins 😉
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"Ya can't make an omelette without breaking just a few eggs" 😉