Ice water may not be cold enough to keep the ether in 100% liquid state. If it is vaporizing/boiling at even the smallest amount, it will create pressure in the tube/bulb/bourdon tube and purge out of the liquid solder. Try dry ice for a colder bulb.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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