Well I have never stuck an inline myself, but I have fixed a number of stuck ones. I use PB Blaster as a sort of cleaning and lubing combo after it soaks for 24 hours I pour the break cleaner to it and let it soak another 24 hours if it is still wont break loose I put the air wrench on it so far they have all come free. The old hawkens that someone wants a barrel changed on can be the most difficult. Lee