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vtsteam:
Then I turned the base upside up, and drilled for the retaining pin and a hole to connect the valve passages with the pump cylinder:

vtsteam:
I''m going to use a 1/4" brass pipe nipple as the pump cylinder. I cut the threads off one end and turned a small step in the end:

vtsteam:
The pieces of the pump base -- I faced a small recess in the base to fit the step in the pump cylinder.

I had to offset the cylinder slightly to clear the retaining pin:

vtsteam:
The pieces together and ready to silver braze:

vtsteam:
Brazing complete:

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