Right: locking plate and tube removed.
Most of them can be clicked to see larger versions for more detail.
This account relates to a 1993/4 car. I cannot guarantee that yours will be the same.
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Left: the complete assembly. Right: locking plate and tube removed. |
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Below: the cover removed and inverted. |
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Detail, showing push-fit of worm gear shaft into plastic backplate. |  |
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Rear view, partly reassembled, prior to re-fitting the locking plate and tube. |
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Left: detail, showing fitment of worm-gear shaft. Right: end view of complete assembly. |  |