So, I got a bad front brake hose on my car (won't let caliper release). I've got the fitting cracked loose where the frame-side hardline mates with the flexible hose. Sure, I got it broken loose from the threads, but the hardline is trying to spin with the nut. The hardline is rusted to the inside of the nut. Obviously, I'd rather preserve the existing line than just snap it off and go through the hassle of running a fresh hardline. I've only had PB Blaster on it for about an hour. I'm going to douse it a few more times and try again tomorrow evening, which will be about 30 hours, give or take. Maybe that'll do it, maybe not. I think part of the problem is that the line is a pretty long run until it's tied down. It just twists the line but doesn't put much force into breaking the line loose from inside the nut. Is there a way to GENTLY BUT FIRMLY hold the hardline, without crushing it, to help apply a little more force and possibly work the line back and forth until it unglues itself from the inside of the nut?