I worked on the steering of one of the museum's carriers a number of years ago. The cam had been overbuilt up with weld. I replaced the cam with one that had been buried for the last 40 years, and despite the bit of pitting, it worked out beautifully.
There is geometry to those plates that should not be taken lightly, a Lynn has pointed out. You could try and build up the effected areas, but don't over-do it. Or try it just as it is....I think you would be surprised at how well it works.
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