Sill
Cut a l-3/8 in. (34-92 mm.) diameter hole in the sill
panel forward of the heel board 'Y' and 1-1/2 in. (38-1 mm.) from the floor
'X' also cut two 11/32 in. (8-73 min.) as shown in the illustration.
Insert the sill tapping plate through the 1-3/8 in.
(34-92 mm.) diameter hole using the 7/16 in. (11-11 mm.) diameter screw to lift
the plate into position. Place a spring washer on a 5/16 in. (7-94 mm.) diameter
hexagon head screw and pass it through the cover plate with the register away
from the head of the screw and attach it to the sill and tapping plate. Remove
the 7/16 in. (11-11 mm.) diameter screw and finally secure the cover plate with
the second 5/16 in. (7-94 mm.) diameter hexagon head screw and spring washer.
Cut a 1 in. (25-4 mm.) diameter hole in the sillboard
trim as to clear the projection of the mounting bracket, and so coincide with
that of the hole drilled in sill panel.
Place the bracket and waved washer, the shouldered
distance piece (the smaller diameter of which will slot into the bracket) and
plain washer on the 7/16 in. (11-11 mm.) screw provided and screw the assembly
into the hole in the sill.