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As a general tip - vibration is used on large ships to remove stuck parts. This has worked for my purposes so far.
A small unit made for a "vibration table" is a can motor and a steel plug with a hole drilled off center for the shaft.
The off center load causes the unit to shake
This is clamped to the shaft and allowed to vibrate while wd-40 is added where gravity will draw it to the corrosion.
If you want to get fancy you may vary the voltage to the motor. This will help you find the harmonic frequency of the two parts which will help in removal. Good luck!
Be careful of seals, bushings, etc. when doing this.
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