Put an extension on your socket/nipple tool , put the cylinder on a block of wood -or- similiar, put the tool on the nipple and hammer on it (the extension).
The -shock- of hammering on it will loosen it up almost every time.
If it didn't work, heat it up either with a propane torch or similiar -or- in a pan of boiling water -and- repeat the hammering trick again.
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