This is what has been my experience up until this point. But this particular frame seems to "remember" the un-straight position. There is no damage that I can see to any of the lugs or brazes. It just seems to want to curl up like a banana. I was wondering if anyone has ever seen this before. I wasn't aware of straightening frames being such a big deal and I know I'm not the only "non-professional" who knows how to measure a frame and bend stuff back carefully without causing more damage (first do no harm). It really isn't that hard.

I bed pipe for a living as an electrician. I've seen my share of springback but this is a type of "memory" that doesn't seem to match anything I've encountered before.