NOS part for Partner Chainsaw

[Skywatcher]

Greetings All

Would anyone here happen to have a new old stock oil pump push rod for a Partner S55 chainsaw S/N 1984005863? From what I can tell, the part number is 505 31 71-40. This saw appears to have an unnecessarily complicated oil pumping system for the chain. What's happening is the ratchet pawl is no longer moving far enough to advance the ratchet wheel of the pump one tooth per crankshaft revolution. Or does anyone have any other suggestions on how to get this system working again? Thanks and all the best,

Sky