
BULLSEYE INSTALLATION TOOL FOR CYLINDRICAL LOCKSETS
Part Number BULL – Made In USA
Use this tool when locating and drilling cross bore and latch hole when installing cylindrical locks.
Before attaching your Bullseye to the door, make sure that the surfaces of the jig are clean and smooth.
The tool has two rubber pads that will contact the door face. Be sure they are clean and free of anything
that could scratch or mark the door. It is a good idea to wrap the door with a sheet of paper or thin
cardboard prior to attaching the jig as a precaution.
Refer to the lock manufacturer’s recommended specifications for the height and backset (backset will be
changed in the following step) and mark the door accordingly.
Open the Bullseye by turning the Wing Knob (1) counterclockwise so the jig is opened wider than the
door thickness. Set the jig for the desired backset by flipping the Backset Tabs (4) away from the door’s
edge for a 2-3/4" backset or towards the end of the door for a 2-3/8" backset. Position the jig onto the
door.
Turn the Wing Knob (1) clockwise until the jig is just touching the door. Turn the Thumb Screw (5) in until
it is snug against the opposite Side Plate (9).
Tighten the Lock Nut (6) to maintain this setting. Loosen the Knob (1) and align the Centerline Notch (see
drawing) with the height line previously marked on the door and tighten Wing Knob (1) firmly against the
door.
If the lock you are installing specifies a 1-1/2" cross bore, leave the Reducer Bushings (7) in place. If it
specifies a 2-1/8" cross bore, remove the bushings by loosening the Set Screws (8) with the hex wrench
provided.
Using the appropriate bit or hole saw, drill the cross bore halfway from each side. Next drill the latch hole
with the appropriate bit or hole saw. Loosen the Knob (1) one full turn and carefully remove the jig from
the door. Hint: the strike plate can be located by inverting a 1" hole saw into the latch hole. Shut the door
and reach into the cross-bore hole and with a push and twist of the hole saw, mark the door jam.
An additional feature of the Bullseye jig is two 1/8” pilot holes to locate through bolt holes on many of
today’s popular lever locks. The holes are 2-3/4” apart and work with many popular levers such as Marks,
Schlage, Yale and Sargent. Before utilizing the pilot holes be sure to check the lock template and be sure
the spacing is 2-3/4”, or 1-3/8” from the centerline of the bore. We recommend you use a small drill bit to
locate the holes, remove the jig from the door and drill halfway through the door from each side with the
appropriate size drill to complete the through bolt holes.