ARB RD129 - Manual (Page 18)

4 Installing the Air Locker
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c Remove any sharp edges that may chip off from around the hole
and fall into the housing.
c Very carefully, remove the rags and inspect with a service light
inside the housing to insure no metal filings are left behind.
4.6 Modifying the Bearing Cap
c A hole must be drilled in the seal housing bearing cap for the seal
housing tube to pass through.
Figure 8.
NOTE : Take time and double check when drilling, as bearing
caps are custom fitted to the axle housing and cannot
be replaced.
c Hold the seal housing end of the bearing cap steady for drilling in a
vice clamp.
NOTE : Do not apply too much clamping pressure with the
vice. The bearing cap may be damaged.
c Using a pedestal drill, drill a 6mm [¼’’] hole through the bearing
cap, in the position shown, so that the drill is against the edge of
the bearing stop. (Fig.8.)
c Debur both ends of the drilled hole to remove any sharp edges.