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@retrorider
try cillet bang on it, sounds mad but worked twice for me. I had a stem stuck in a calton frame which i had tried wd40 soaking for ages, hitting with a hammer (with a block of wood) but to no avail. Saw a thread about caustic soda and using a cleaning agent and tried Cillet bang. Took the top allen bolt out and sprayed it down the stem and turned it over to spray from the bottom too. Soaked for about 5 mins and with a bit of jigging about to my disbelief it came out.
Thought i' try it just to see if it wasnt a fluke with another frame i'd given up on and after letting it soak and then using the hammer and block technique lightly tapped it out with no trouble.
Give it a go.