Mig welders can just tack a small screw or bolt on the crease and use your device to pull the dent. Heh, in a extreme case on a 67 T-bird beater I had I tacked a bolt to a VERY deep crease and hooked a chain to the bolt and nut and hooked it to the company forklift since I was doing it at work and gently eased back until I pulled it out. Since the car was indeed a beater I was just trying to get it pulled enough to be in the general vicinity of where it should have been. I then cut the tack off removing the bolt, ground the tack smooth and primered. Of course if we were going for perfect the rear quarter panel should have been replaced, but I actually got it straight enough where I could have probably mudded it although it would have been thicker than I like doing it.
Regards,
Rev. D.