We chiseled the remains of the old castle section off of the inner sill before fitting the new castle. We clamped the castle in place and made sure it lined up before welding into place.
Some trimming of the membrane is necessary for fitting properly, and this is done with the castle welded in place in the proper plane.
Before welding the membrane in, we welded in a new jack support bracket. We then masked off the flanges and sprayed rustproofing inside.
After the rustproofing was allowed to dry we clamped the membrane in place and used our spot welder to fix it in position.