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vtsteam:
So today I was thinking about how to solder a stainless steel ball to a guide piece, without getting silver solder on the working valve portion of the ball. We're talking about a 5/32" diameter ball (4mm).

I didn't have much faith that I could manage a strong butt joint to thin wire, or keep the solder masked properly.

Then I thought of a possible way to do it with strip brass, so had to try an experiment:

Spotting with 1/8" drill -- new valve seat also shown:

vtsteam:
The ball in place. The real question was whether I could solder something this small without getting solder in the wrong place.

vtsteam:
The setup for soldering. Flux paste and a tiny sliver of silver solder. I decided to heat from the bottom, as I was sure my torch would blow these bits right off the brass strip:

vtsteam:
It worked!  :ddb:

I did have to steer the silver with a tiny bit of wire because the flux boiled and moved it away from the ball. But it did work.

Here's a close-up outside in stronger light:

vtsteam:

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