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The slow-speed escapement is held by two screws (photo 19), one of which must be accessed through one of the gears. This should line up if you cock the shutter and set 1/8 sec -
something not easily achieved at this stage! You can turn the largest gear slightly counterclockwise (as viewed from above) to achieve the same effect, and hold it there while undoing the screw. Once the screws are out, lift the mechanism off, carefully manoeuvering it around the shutter speed-selector parts. It will unwind too as soon as its released, dont panic!
Dump the whole mechanism into cleaning fluid and let it soak a while. A small brush will help to clean it if you have one. Let it dry fully before lubricating. Dont run the mechanism without lubrication, its quite delicate and you could damage it this way.
Using a very thin oil, lubricate the points shown (photos 20 & 21, points marked 1 & 2, with arrows on the reverse -- top of next page).
Oil VERY sparingly, using an oiler or a fine needle to get oil onto the spot required. There are the six pinion pivots (three on top, three underneath) and the escapement pawl pivot (photo 22), the wind-ratchet (photo 23) and the spring. Lightly, oil the smaller pinion (gear teeth!) on
each shaft too. Oil the teeth of the escapement pawl, again sparingly. Excess oil will only run somewhere it doesnt belong and attract dirt.
Using a medium grade oil, oil the largest ring-shaped gear where it runs against the O-shaped plate (photo 20, points marked 2 ). Turn the mechanism upside down and note the pin on the ring-shaped large gear. Turn this gear clockwise about 3 turns to wind the mechanism, then release it. See that the mechanism runs smoothly and unwinds completely. It should come to rest in about the same place each time and not stick at any point. Try it several times, partly to check this and partly to run the new oil around. Once youre happy, set the mechanism aside somewhere clean (like a Zip-Loc plastic bag) while the other work is done.
Now is a good time to deal with the RF/VF, whilst access is easier, then refit the slow-speed escapement and flash-synchroniser, as detailed below, as the last jobs before refitting the top cover. It is also a good idea to remove the shutter speed selector and grease the part it sits on - undo the screw holding it, under which is a spring. Whilst at this stage, oil the shutter drum shaft pivot: refer to photo 25 or 26, oil sparingly between the top plate and the selector parts, where the shaft runs through the plate. Also, check the operation of the second curtain release arm (photo 26A). To remove it, unhook the small spring, noting carefully how it fits. Withdraw the shaft, clean and lubricate with thin oil then refit it and reattach the spring.
Refitting the slow-speed mechanism is the reverse of removal, with a couple of complications! Read on.
The ring-gear pin (photo 25) is engaged by the speed-selector at slow speeds. The slower the speed the further it winds the mechanism. The speed-selector sits a little lower on 1/125 or faster, so it misses the pin for higher speeds. At 1/60 it doesnt quite get to winding anything, but for 1/15 or less it does. The little cam sticking out underneath the mechanism (photo 24) is what blocks the shutter closing-curtain (via a tiny lever) until the delay time is up. Photo 25 shows the shutter cocked at 1/125 with selector (left arrow) missing the pin (right arrow). Photo 26 shows the same situation for 1/2 sec, where the mechanism has been wound some way (same parts arrowed).
Before refitting the mechanism, apply a TINY dab of silicone grease to the cam periphery. Be aware that the cam operates a tiny lever and must sit beside it, so lower the mechanism
absolutely straight for the last few millimetres to avoid trapping the lever. The cam point must not sit on top of the lever, hence the mechanism must be held as described below. Before refitting the slow-speed mechanism, set the shutter speed to 1/1000 - do this by lifting the speed-change and turning clockwise to the last notch.