Putting the (Larsen) mount in place.
Side note, because of the combined thickness of the roof metal and backing plate, getting the lower portion of the mount to pop into the hole was a bit challenging.
While the combined thickness wasn’t an issue with regard to the final assembly, the way that the lower portion fits, it needs a certain amount of space to slide around.
A small grinding stone and the dremel were used to adjust the hole a bit, and to dress the edges of the hole/remove any burrs.
