Hi,
Very nice work which seems to have solved the problem. Could you show detail of the gas jet(s)/outlet under the block of ceramic?
This is a photographs of the gas/air tube made from K&S 1/4" brass tube with one end cut at about 45 degrees
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This photograph shows the tube soldered in place touching the inside of the burner with the cut angle at the bottom, the ceramic clears the tube by about 1mm, this isn't critical.
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I hope this helps.
Take care Tony.