For replacement parts, contact the tool manufacturer or authorized
dealer.
Figure 2. Microstop Countersink
Tool (Assembled)
The Microstop Countersink tool is made up of the following
parts:
1
Shaft
2
Locking ring
3
Cage
4
Countersink bit
5
Nylon foot
6
Chuck
Using the Microstop Countersink
Kit
Use the Microstop Countersink Kit to countersink holes for
countersunk rivets:
A correctly countersunk hole allows the top of the installed rivet
to sit flush to the surface of the surrounding material.
CAUTION
Adjust the depth
of the countersink cage assembly on scrap material before attempting to
countersink a hole on a vehicle being repaired.
Use a drill with the appropriate size pilot bit to drill a pilot hole in a
piece of scrap material.
Pilot bit sizes:
4.8 mm (3/16 in)
6.5 mm (1/4 in)
CAUTION
When performing a repair, drill holes far enough away
from corners and other obstructions to provide enough clearance
(approximately 18 mm or 11/16 in) for the countersink cage
assembly.
CAUTION
Always
use the countersunk rivet size specified in the applicable repair
procedure.
Select the appropriate countersink bit.
Countersink bit sizes:
4.8 mm (3/16 in)
6.5 mm (1/4 in)
Screw the countersink bit
into the threaded insert of the countersink cage.
Compare the adjustment of the countersink cage assembly to the head of the
countersunk rivet to be installed.
Note
The distance that the angled portion of the countersink bit protrudes
from the nylon foot when the shaft is fully extended should be slightly
less than the distance of the angled portion of the countersunk rivet
head.
If the countersink cage setting does not need adjustment, continue
with Step 5.
Install the countersink cage
assembly onto the drill.
Use the drill with the
countersink cage assembly to countersink the pilot hole drilled previously
(Step 1).
Note
Continue
drilling until the shaft of the countersink cage assembly reaches the
end of its travel and no more debris comes out of the hole.
Insert a countersunk rivet
into the hole and test the flushness of the rivet head.
If the rivet head is flush with the surface of the material,
continue with step 8.
If the rivet head
protrudes above the surface of the material, adjust the
countersink cage setting, as described in Adjusting the Depth of the Countersink Hole and then repeat Step
7 until the rivet head is flush with the surface of the material.
Use a drill with the
appropriate size pilot bit to drill pilot holes in the repair area.
Use a drill with the
adjusted countersink cage assembly to countersink the holes in the repair
area.
Note
Continue drilling until the countersink cage assembly reaches the end
of its travel and no more debris comes out of the hole.
Adjusting the Depth of the Countersink Hole
Adjust the countersink cage assembly so that the
initial countersink depth is slightly less than the rivet head to avoid making
the countersink hole too deep.
Loosen the locking
ring.
Pull the chuck back to
disengage it from the cage.
Adjust the cage.
Turn the cage:
Counterclockwise
to shorten the cage (increase the amount of countersink)
Clockwise to
lengthen the cage (reduce the amount of countersink)
Release the chuck.
Check the depth setting
by pushing the shaft forward to the limit of its extension. Repeat steps
2 through 4 until the cage is in the desired position.
