stud welders are ok for fast work . but for fine finsh work hammer and doly i would like to see were you can not get on your 37 ? there has been many times were i had a helper hold a doly or a port a power with a 2by4 or rubber end for soft push another way is lite tack welds to sheet metal grab it with a mowe clamp pull with come along or sluger with a hook . i cut the back side out to get in were i need or cut in a door jam to get at the skin rework it with a flat spoon or re work a old leaf spring work s good. work it out then weld it back up were you cut it open if you can sit in the trunk i hand sanded the back of the panle to show up the spots that need work . beat up metal with a doly from the back side work the low spots up