Some guys make there own washers with a 1/8" hole in them. you place them on the back side of the butt joint and put your cleco through it to hold the panel in place. Do your welding,then release the clecos and the washers fall off,then retrieve them.
I know some body men that use this method.
Tim
1951 3100 Chevrolet1951 Chevrolet Suburban CarryallImage"A house is built with boards and beams. A home is built with love and dreams."
"Look deep before you leap !!!" / "Everything is Everything"
"If I say a mouse can pull a house, hitch him up"