I took a piece of brass, (or it could be aluminum-bronze), and milled a channel with an 1/8" ball end mill. I made the channel about .150" deep and in the center of the piece I took a larger ball end mill and made a deeper area where I join the rods.
The deeper basin does a good job collecting and holding argon but I made it a little too big and deep. I made it about .200" deep and about 3/8" wide. It only needs to be a little wider and deeper than the channel.
Other than needing something to either hold down or prop up the other end of the long piece it works pretty good.
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