How is the 3/8" pivot hole stud for brake bracket attached to frame? Is it welded? I see the hole (see pic 1) which is not drilled thru the frame and have seen pics of the stud being threaded and double nutted and also seen a smooth stud with a hole in the end for a cotter key. I do not have a welder; so could I drill thru the frame and place a 3/8" bolt and a nut on the outside (provided there is clearance behind the brake drum) and install it? Pic of 3/8" stud hole in frame, then pic with screwdriver in pivot hole showing proper install position and final pic showing threaded stud with cotter key installed. Thanks.