Tecomec made in Italy replacement main motor return spring, Tecomec part# K00200154, this motor spring is for Oregon Chain Grinders models 520-120, 511AX and Tecomec Jolly Star grinders produced by Tecomec, this motor return spring is OEM and not aftermarket. This replaces Oregon part# 522651. 

Tecomec is the world's largest manufacture of professional chain grinders.

Tecomec is an Italian company established in 1985 and is located in the Reggio Emilla region, this area is renowned worldwide for its top in quality technology. Tecomec is a company of the Emak Group which, in turn, belongs to the Yama Group with over 30 companies affiliates and represents the biggest Italian group engaged in the design, production and sales of farming, gardening and forestry applications.