I had the identical pintle on my old Enterprise, and like you one day I failed to engage both pintles and the force of water on the rudder bent the pin.
I put the bent pin in the vice and squeezed and hammered it back into line, and it is still in use.
Or for a near match see http://www.tridentuk.com/sailing/product-Holt_Allen_Fixed_Rudder_Pintle___54mm_-AL_A4017_54.html