When off face maybe you could reduce the size of the trunnions,
thread them on the outside and fabricate a new trunnion with
internal thread to fit over. Or even epoxy on a new trunnion
over the reduced one, doing away with the thread making complication.
Just an idea from a total layman.
Surely easier said than done.

JC(AL)


"...it is always advisable to perceive clearly our ignorance."ť Charles Darwin