It MAY be the Alliance U100 or U110 models.
5. What happened to the Alliance Manufacturing Company (Alliance, OH)?http://www.rotorservice.com/faqs.htm
Alliance stopped production of their rotors in 1994.
Norm's Rotor Service purchased their entire parts inventory for the HD-73, U-100, and U-110 rotors and controls. CATS performs repairs and has parts for some Alliance models.
CHECK with C.A.T.S. or Norm's Rotor Service for details / parts / repairs.
C.A.T.S. - Rotor Doctor Online
7368 State Route 105
Pemberville, OH 43450. USA
Norm's Rotor Service
448 Green Glade Rd
Birmingham, AL 35244. USAhttp://www.rotorservice.com/index.htm