Bronze Rudder shaft is cracked

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I need community advice: on the Hallberg Rassy 41, since 1979, I found that the bronze 40 mm steering shaft almost broken crack passes between the body and the steering blade. Question: it is preferable to 1- restore the shaft in a specialized workshop for the repair of propellers, 2- replace with a new shaft made of bronze (the brand of bronze that is used is unknown), 3- put a new shaft made of stainless steel (also the question of Steel Mark). I will be very grateful for any advice.