Swing arm bushing failure

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Good morning, thanks for the video, i assume the bolt was torqued up when the video was taken, it appears that the "collars"are still not compressed,feel free to click on Popgun's link and partsfish will open in a new window, have a look at parts; 6, 8 and 9, they all "thread" onto no 7 ( the bolt ) and need to be clamped tight in order to function as designed, i agree, it needs a bit of thought to figure out how it is supposed to function, i hope my video helps to understand how that happens despite the brief text.
http://cb1100forum.com/forum/showthread....#pid255014

Even if there is a slight gap of less than 0.1 mm the collars are then free to move on the bolt and produce the play you demonstrate.

The shim ( it's actually a washer ) can be placed either between no6 and the frame ( brake side ) or between no9 ( on the sprocket side ) and the frame.
Mine is made from brass sheet because of the low oxidation properties and the hole was drilled first and has a close fit around the shaft, it was then cut out
to conform to the swingarm shaft but such that it could be manipulated in place without too much difficulty.

Normally there is no need to remove the swingarm but it may be interesting to do so, at the same time maybe check for sufficient grease in the bearings and
where the shock absorbers mount to the frame, they were dry on my bike and a little brown dust had formed, up to you.

The other issue is that water could have entered inside the swingarm through the gap, ignoring the dust ( water ) seals on either side of the bearing area,
i'm thinking the bearings themselves may have been affected depending how much grease has been used in assembly.

You are well on the way to solve this thing, good stuff