Operating instructions

13
NYLON KEY REPLACEMENT
Tools required: 3mm Allen key and screwdriver, a fine file may also be needed.
(1) For this operation, dismantle as described on page 9 onwards, but only the mast
collars need be removed, the tubes may be left in their nested position. Mark the
base tube with a pencil so that the collar is assembled at the same place.
(2) When the collars have been removed from the end of the tube, the green nylon
key can be seen in its slot inside the main collar. After removing the old key, slide
the appropriate tube out until the stainless steel ‘stop band’ shows (no further
please) this is the lower end of the keyway channel. Slide the new key along this
key way to ensure it runs smoothly along the entire length, if there are any tight
spots carefully dress the edge of the keyway with a fine file, do not dress the key
itself or you will end up with a loose fit elsewhere.
(3) There is an adjustment screw and locking screw behind the key slot in the collar,
back these off and insert the new key – largest collar first. Replace the collar onto
the tube using the pencil mark to locate the same place. Use the Allen key
through one hole in the collar to locate the hole in the tube and line it up exactly
so that the dog point screw will not miss it, failure to locate the screws in the tube
means that it would come apart when pressurised.
(4) Repeat this operation at the position directly opposite the first screw, then fit the
rest, and the locking screws. Do not over tighten, when tight go further quarter
turn but no more. Use a thread-locking compound (Locktite 243) on the pan-head
screws.
(5) Now adjust the nylon key screw, it should be just tight enough to allow the tube to
run smoothly, again do not over tighten, and finish with the locking screw.