Hole making 3

Fig 1: Identifying Edges To File

Courtesy of VOLVO CARS OF NORTH AMERICA.

NOTE:
It is vital to check using a position light that there are no gaps before filing up to the outline. If too much metal is removed, the door must be changed.
File the hole just enough so that the position light can be fitted easily, but not so much that any play is created.
File any sharp edges.