Brass :E
Costs more, might be easyer to machine but then so is plastic.
Why solder blocks? might seem better but its realy not worth the effort.
Main reson I dont like soldered blocks is its almost impossible to remove the oxidation on the inside, which happens when heating up. If I had to use brass top I would seal it using sillicone sealant or something, but not solder.
Plastic (polyethylene or polycarb) is so much easyer to machine and is quite easy to seal, so is best imo.
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