The solar finder is self-aligning and sits on top of the
The first step was to cut two pieces of foam core into 2-inch wide strips. The longer you make them the more accurate your first alignment will be. Mine were 9 inches long. Glue them together along the long edges with the hot glue gun, setting them at right angles to each other to form a V shape.
All cuts should be as accurate as you can make them as this will affect the accuracy of the finder.
Be careful with the apex of the V, don’t let the ends get dented as you’ll need this edge later when aligning the two sighting pieces.