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My Butler Double Gear’s pump rod has the same key of sorts with countersunk on one side like that.Kenneth wrote: Sat May 14, 2022 4:35 pm Another thing I found interesting, the 2 bolts on the pump rod have a key of sorts
on the taper. Then the countersunk holes have a notch to receive that. Allowing
you to tighten the nut, without it spinning. See pics.IMG_20220514_144114.jpg
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My Father said he has seen these on old equipment and such.
Kenneth