Hi all. Long time reader, first time poster. I recently purchased an M101. While it needs a bit of work, it's in pretty good condition. What I need help with is that it looks like someone ran into the side of it. Thus the frame around the top of the bed is bowed inward on one side. Can anyone give me some advice on how to straighten this? I took a 2" thick i-beam and ran it across the dented side and used some clamps to pull the dented area out toward the i-beam. While it did the trick with the clamps on, it bowed in again when I removed them. I'm not really sure what direction to go now. Thanks!