to add:
the Expansion plug you speak of, does occasionally leak, but more times than not, the leak is from the cork gasket between the hydro and rear end as John mentioned.
The relief valves are on the top of the hydro, 2 of them side by side with seems like 7/8" hex heads on them.
some have little buttons in the center of them, later styles just have small holes
in the center of them.
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