The FullStop® Nemesis Ultra wheel lock is designed to secure the shield onto a
replacement wheel bolt so that the Wheel Bar protrudes through one of the gaps in a
wheel to prevent wheel rotation.
1. Before the product can be used, one of your existing wheel bolts must be removed
and replaced with the Receiver Wheel Bolt (4). This replacement bolt has been designed
to fit the majority of caravan road wheels, however, please check that your existing wheel
bolts are of the same specification. The supplied Receiver Bolt (4) has a 12mm x 1.5mm
thread pitch with a 60° conical seating. If in any doubt consult the caravan manufacturer
or wheel supplier BEFORE installation as it is possible to damage the hub of the caravan
if the screw threads do not match.
Once you have removed one of the wheel bolts, the Receiver Wheel Bolt (4) can be fitted
using the Wheel Wrench Adapter (9) which enables you to use a standard wheel wrench
that fits a 19mm hex head (see Fig.B).
The Receiver Bolt (4) should be tightened to the correct torque setting for your wheels.
Note: Check your Owners Manual for details or consult a qualified technician. Do not
over-tighten or use an impact wrench.
2. There are many possible combinations of how the Nemesis Ultra may fit to a particular
wheel. Fig.C shows that the Wheel Bar (2) is designed to slide in or out as necessary
depending on where the Receiver Bolt (4) has been installed in relation to which gap in
the wheel’s spokes the Wheel Bar (2) fits through. Note: When installing the device the
Wheel Bar (2) should be located through the lower part of the wheel so that it does not
hit the chassis or other obstruction (see Fig.D for guidance).
3. Before using the device it may be necessary to add Spacer Rings (5) to ensure that,
when fitted, the back face of the Shield Plate (1) is as tight as possible to the face of the
wheel when the Lock Unit (3) is locked into the Receiver Bolt (4).
To check this, first fit one of the keys into the Lock Unit (3) and rotate it through 90°
clockwise which releases the locking ball bearings. You can now install the Lock Unit (3)
through the aperture in the Shield Plate (1) as shown in Fig. A.
Offer up the assembly to the Receiver Bolt (4) and guide the end of the Lock Unit (3)
into the Receiver Bolt (4) as far as it will go. Lock them together by rotating the key anti-
clockwise through 90° and remove the key.
If the Shield Plate (1) is tight against the face of the wheel then no further adjustment is
required. If, however, there is a gap between the back face of the Shield Plate (1) and the
face of the wheel then Spacer Rings (5) must be used.
(cont overleaf)
