Devon&Devon Savoy V Assembly Instructions Manual page 24

8)
To position the screws (E), use an iron bit (Ø 2,5 mm) to pre-drill
the column of the shower enclosure in the four points (one by one)
1,2,3,4 shown in the illustration for passage 7.
9)
Be very careful throughout all stages of the shower enclosure
assembly process: both distance "A" between the baseboard and
the shower structure and distance "B" between the latches and the
glass must always remain the same.
A
23
B
E
N
G