8400/8500 DrIll GuIDe
The 8400/8500 Drill Guide is a unique
drilling template that has been designed
to target the fence, relock and lever
screw on Sargent & Greenleaf 8400 and
8500 Series Group I Combination Locks
with the Spy-Proof dial and dial rings.
The 8400/8500 Drill Guide attaches
directly to the dial ring with 4 hex head
cap screws. There are 2 additional hex
head cap screws that will stabilize the
dial. There is no need for dial or dial ring
removal. The 8400/8500 Drill Guide is
designed to target the fence, relock and
lever screw in any of the 4 mounting
positions of the lock. There is no techni-
cal expertise needed to lay out drill points.
lthough the 8400/8500 Drill Guide and Fence Drilling Jig are simple to use, it will never-
thelesss be wise for all new owners and users to read this book with care. Keep in mind
as you read, and as you begin to use the 8400/8500 Drill Guide and Fence Drilling Jig
that it is, in a sense, a hand tool. Like any other hand tool, continued use and practice will
increase the operator’s skill. Power tools will be required in the use of the 8400/8500 Drill
Guide and Fence Drilling Jig.
8400/8500 Drill Guide operation
The 8400/8500 Drill Guide has been specifically designed to fit over the Spy-Proof dial
and dial ring of the Sargent & Greenleaf 8400 or 8500 Series locks.
There are 2 index pins that will align the 8400/8500 Drill Guide to the Spy-Proof dial and
dial ring.
Once the 8400/8500 Drill Guide is in place, tighten the 4 hex head cap screws at 20, 40,
60 and 80 to the dial ring with the 3/16” Allen wrench provided. Then tighten the 2 hex
head cap screws at 90 and 10 to the dial. There are 2 purposes for these last 2 hex head
cap screws. First, to stabilize the dial at “0”, the position at which the lever will drop, and
secondly, to provide more holding power for the 8400/8500 Drill Guide.
The drill guide is made in 2 pieces. The outer cup, which remains stationary when secured,
and the inner template which can be rotated to compensate for the hand of the combination
lock. The drill guide in the diagram is set up to drill a right hand mounted lock. When it is
necessary to change the handing of the drill guide, remove the 2 cap screws located on the
front of the drill guide. Rotate the inner template for the desired lock handing to the index
mark located on the right hand side of the outer cup. Once the inner template has been
positioned, replace the 2 cap screws in the front.
There are 3 drill points mapped out on the drill guide. Hole A will be the primary target
which is the location of the fence. Hole B will usually be the secondary target and is the
location of the lever screw. Drilling for the lever screw is more difficult since you have little
margin for error. Hole C is used to neutralize the internal spring-loaded relock.
It is suggested that your finish hole be 5/16” in diameter. This will allow for extra room
to maneuver within the drilled hole in order to neutralize the fence or the lever scrw. The
use of this tool requires a 6” drill bit.
INDEX PIN
InDeX
marK
V U
R H
V D
L H
