Removed from 1992 Volvo 240 with 2.3 liter engine.   Adjusting mechanism is for the alternator.  Bolt is OEM and will turn by hand.  My information says this is OEM on the following years and models of Volvo:  1985-1993 240  with a 2.3 c engine.   Pictured are the arms I have for sale.  you will receive one of the arms pictured.  I will ship the best one first.