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					Originally Posted by Payton King
					
				 
				You need to do the opposite.  Put the pump in the freezer and the aluminum will shrink and they should pull out pretty easy. 
			
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 if the aluminum shrinks it will hold onto the steel nipples even more; since the steel presses into the aluminum you want the aluminum to expand, thus heating it should help. I will say I've always pulled them out without heating though.
Jody