Tecomec made in Italy replacement main motor return spring, Tecomec part# K00200335. This spring is the original spring that came on these grinders. This main motor spring works on Oregon Chain Grinder hydraulic model 620-120 and Tecomec Super Jolly hydraulic grinders produced by Tecomec, this part is OEM and not aftermarket. This replaces Oregon part# 546946 and Rotary #14613. 

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.