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104 Chapter Eight

Tab

Figure 8.22 Tab on servomotor case that needs to be filed off.

Tab
Filed
Away

Figure 8.23 Tab files off servomotor case.

Bumper Switch

The bumper switch makes use of the center holes. Looking back at Fig. 8.30,
we see the center hole is fitted with a 6­32 machine screw held on by a stan­
dard (zinc­plated) nut, followed by a brass nut. The brass nut has a wire sol­
dered to it. The purpose of this little assembly is just to attach a wire to the
bracket­bumper assembly. Brass nuts are used because it is possible to solder
wires to brass to make electrical connections. This is in contrast to the stan­
dard zinc­plated steel nuts that are very difficult (impossible) to solder.