It would help if you posted a photo so we could get a sense of what "slight" means in this case. I once removed a fairly substantial twist in a framed-up fuselage by soaking the back half in the bathtub for a few hours. Then, using a large screwdriver as a lever, I clamped the fuse to the workbench, pulled on the screwdriver so the fuse twisted the other direction, and clamped the screwdriver in that position and left it until it dried. Came out straight and I'm still flying the plane some 23 years later.