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Next up were these plugs. All they do is seal a "check ball well" in the valve on the
pump assembly- the rod simply keeps the ball from coming up too far out of the
well, and thus letting pressure bleed off briefly 'til it settles again.
I'm not sure how the one was damaged, other than somebody probably tried to put
both balls in one well, and then tried to tighten the plug down on top of it.
Normally I'd have just turned an entirely new plug, but upon inspection I found
ot these have a Whitworth thread- 19tpi. None of my three lathes (at the time)
could do 19tpi, so I had to fix the one by other means.





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