a few months ago i fell off my bike and my bull horns gave the top tube a 1 - 2 punch. so now both sides of the top tube has a dent.... then i remembered there was a way to fix pipes with the freeze method. where you fill the pipe up with water and cap off the ends. i dont have a giant freezer so i waited till temps outside reached below freezing and now was the perfect time. last night i stripped everything off my frame and gave it a shot. surprisingly, it did work. it didnt push it out completely yet, but it takes a few times to full push out the dent. this will be the 3rd time im freezing it.
if anyone wants to try this be careful! dont just fill it with water and leave it for a long period of time. it will bust the tube. only freeze it for a few hours at a time. let the ice melt so it has another starting point to expand.
ill post pictures when im finished.