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Big 4 Valve Lifter Spindle

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I am refurbishing a badly worn valve lifter spindle from a military Big 4 c. 1940.
My first guess was that the step on the end of the spindle would be 50% of the spindle diameter. I now know that is wrong, there needs to be more spindle/less step.
Does anyone have dimensions for the step?
Or a photograph of the spindle, even without dimensions?

Valve Lifter Spindle

 



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