There is only one product that I have never seen to fail in getting stuck metal parts to come apart and that is Aero Kroil by Kano Laboratory. I would highly recommend it. Keep it off the boo. just spray it on something like a dubbing needle and apply droplets to the edge of the ferrule.
[url=http://www.kanolabs.com/:4ff2b]http://www.kanolabs.com/[/url:4ff2b]

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Joe