The second side is now bent with the mallet, and clamped in place.
There may be some misalignment at the notch after the sides are bent, make sure both sides are clamped firmly.
Cut both sides at the same time with a hacksaw, or cut off wheel, at the notch to align the edges. Recaulk the edges, and recut if necessary.
Finish shaping the joint with the caulk.
Spot weld the joint with the clamps on. Reshape the joint if necessary.
Desoto Firewall Recess(Cont.)