Replacement spring for oil pump on Craftsman & Poulan electric chainsaws

Only fits certain electric chainsaws. Partial list of applicable models-. Poulan: 400E (PP400E), 400EX (PP400EX), ES300, ES350, ES350WT, ES400, PP300E. The oil pump itself (second pic) has been discontinued and is impossible to find now BUT this spring is often the only part that is broken as the pump is very simple (a button pushed by a cam on drive gear 530053048).

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Poulan

Poulan Oil Pump Assembly | 581071401