Great news!
Rolling Stone 1980:
seven years ago, close buddies Lindsey Buckingham, Tom Moncrieff, Richard Dashut and Stephanie Nicks lived together in a small house in Los Angeles. Now, Buckingham and Nicks are in the band, Dashut is their coproducer and Moncrieff most recently played bass for Walter Egan's band---which Buckingham has produced---and helps Stevie make demos.
http://www.nicksfix.com/rs_issue310.htm
He also was in the Buckingham Nicks band when they played those very few dates in 1975.