34
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14.3 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.
14.4 Locate slide clamp strip (10) in the slot in the underside of the platform and hold it in position
using the rounded end of tool
3390-909TL
inserted from the top face of the platform. Insert slide
release (27) 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.
14.5 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
3390-909TL
.
14.6 Position spring (28) on the cylindrical end of tool
3390-909TL
. 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.
14.7 Apply Loctite 222E to screw (26) and four screws (8) and secure the platform to the RH side
plate and the tilt unit housing.
14.8 Confirm that the slide release operates freely and that the spring returns it to the outward
position.
14.9 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.
14.10 Apply white bearing grease to the threads of clamp screw (3) and screw it into the lug on the RH
side of the platform to clamp the platform slide.
14.11 Degrease grub screw (5), apply Loctite 222E to the threads and install in knob (4). Fit knob (4) on
the hexagonal part of clamp screw (3) so that the platform slide is clamped when the arm points
vertically downwards and is free when the knob is turned counter-clockwise to the stop. Tighten grub
screw (5) to secure the knob.
Final assembly
15
The pan and tilt drag control knobs are set so that drag begins to be felt between 1 and 1.5 on the
scale. Set the drag knobs as detailed in
Section 4
.