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This video got requested a good while ago, but I haven't really had a stuck stem until now! The bike is a 1970 something O'Brien Challenge, so for 40 odd years, that stem has been collecting water.
The first sign of a fight was the bolt snapping. I knew then, that the expander “nut” (or collar) was rusted in place. After that, I soon found out that the stem didn’t want to move either.
I always start by loosening the top nut and trying to spray some penetration spray around the base of the stem / top of the steerer. Most of the time this works, sometimes it will need to be repeated, but this time there was no joy.
Second attempt was flipping the bike over and filling the steerer with fluid. Unfortunately with mine, there wasn’t that solid seal needed to hold the fluid and it just ran straight out. No joy.
My third attempt was using heat. I repeatedly heated the top of the steerer tube, in an attempt to expand the metal and break the corrosion bond. I heated it and then cooled it with WD40 (Not at the same time... WD40 is flammable!). After numerous attempts it still wasn’t looking so I left it for the day. When I went back the next day to film the heating section properly, I found that it had actually worked!
Be patient, be safe. Don’t try any method you aren’t comfortable with.