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18.9 Lubricate needle rollers and cage of needle roller thrust bearing (23) with white bearing grease.
18.10 Wipe two thrust washers of thrust bearing (23) to remove grease.
18.11 Install one thrust washer, thrust bearing and a second thrust washer of thrust bearing (23) on the
spigot of adjustment slide sleeve (21).
18.12 Assemble Spirol ring (25) onto the neck of balance knob assembly (24).
18.13 Lubricate thread of balance knob assembly (24) with M204G grease and screw it into adjustment
slide (38) of the balance spring assembly until it is in contact with the thrust bearing. Do not tighten
further at this stage.
18.14 Using circlip pliers, install Spirol ring (25) in the groove in mechanism housing (16) to retain the
balance knob.
Platform
19 Install the platform as follows (Fig 6.2):
19.1 If removed, install dowel pin (7) in platform (8) to leave the end projecting 3.5 mm. Loctite 638
may be used to secure the dowel pin if required.
19.2 Degrease three threaded holes in the top face of tilt housing (28), two threaded holes in the edge
of platform (8), one screw (36). and four screws (4).
19.3 Support the head securely in an upright position and set the top surfaces of the tilt drag housing
and the RH side plate approximately level.
19.4 Locate gib strip (10) in the slot in the underside of the platform and hold it in position using the
rounded end of tool T39827 inserted from the top face of the platform. Insert slide release (34)
downwards through the hole in the platform to locate in the underside of the platform. Ensure that the
slide release is free to move and is inserted with its slot towards the centre of the platform.
19.5 Holding the slide release in the fully out position, tilt the RH edge of the platform down and
engage the lug on the side of the platform in the notch in the RH side plate. Lower the LH side of the
platform into position on the top face of the tilt unit housing, ensuring that the lugs on the underside of
the platform enter the corresponding slots in the top face of the tilt unit housing and the 2 mm dia Spirol
pin in the top of the tilt unit housing enters the slot in the slide release. Remove tool T39827.
19.6 Position spring (35) on the cylindrical end of tool T39827. Holding the tool so that the cylindrical
end points slightly downward, lift the LH side of the platform just enough to allow the spring to be
introduced between the top face of the slide release and the underside of the platform. Use the tool to
guide the free end of the spring into the slot in the slide release, compress the spring against the 2 mm
dia Spirol pin until its outer end drops into the slot in the slide release, lower the platform to rest on the
tool and withdraw the tool.
19.7 Apply Loctite 222E to screw (36) and four screws (4) and secure the platform to the RH side
plate and the tilt unit housing.
19.8 Confirm that the slide release operates freely and that the spring returns it to the outward
position.
19.9 Insert platform slide (1) into the rear end of the platform dovetails, check that it is retained at the
front end by the dowel pin and at the back end by the slide release.
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