Concealed Door Bottom Sweep Replacement

This repair is the replacement of a concealed door bottom sweep. The sweep is not adjustable but is far less visible than comparable door weatherstripping.

Link to the concealed door bottom sweep

Link to the Weatherstripping nails

For those who are interested in the flush cut saw used to cut the weatherstripping:

[shellismith]

Why so many nails? Did the old seal have that many?