I am having the same troubles with sprockets and previous owners as you are, i found myself a 1992 model a few weeks ago
this is what i found under the sprocket cover
a new lock tab from wemoto sorted that but i was unsure of sprocket orientation same as you.
I noticed some slack in the cush drive aswell and this is what i found after removing the rear wheel..

The cush drive has fallen appart and was shimmed with four washers
i have replaced the rear wheel bearings and the cush drive bearing and a new cush drive was ordered from cmsl which will hopefully arrive soon
i will report back when it is all tightened up.
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