I had never heard of the blowtorch technique either, I just thought it would probably work, and it did, quite well. I don't think it would work on deep crazing, but why not try? Worst case scenario it bends the whole sheet and you need to replace it.
I do really feel like a picture would help your helpers on this one. Also, you should just take it apart, even if the frame needs to be bolted back together, at least it will look better!