Thoroughly grind all scale off the outside of the steel. Cut away just enough steel on the outboard ends of the humps if they ride up onto the lower engine mount strengthening layers. Apply packaging tape to the inside of the humps so that resin and flox does not go through the holes. Clamp suitable straight edges as shown to ensure that both humps are in plane. Position of humps is as shown (measured from centreline and from aft face of firewall plywood. Once happy with position tack the humps in place using some flox around the edges. Form a small fillet all the way around using your finger.
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