ARB RD40 - Manual (Page 18)

3 Installing the Air Locker
16
Figure 10.
3.7.2 Notching the Bearing Cap
Use a soft jawed vise clamp to hold the bearing cap steady.
Using a 6.35mm [¼’’] rat-tailed file. File out a notch in the bearing
cap from the closest edge until an adequate notch has been cut
around the position of the punch mark. (Fig. 11.).
Figure 11.
File a chamfer around the inside edge of the notch to remove any
sharp edges from the notch that may chip-off and fall into the
housing.