Great,

Thanks for that. I'm hoping to use some of these photos for the History Record
and link to this post as a restoration exemplar.

I would like to confirm the main differences. Is this right?

The main differences in chassis are:
- minor changes in base (as discussed here).
- the height adjustment moved from all metal slot and sector to
metal lever and plastic sector.
- the rear flap was changed to a new "Automatic safety flip flap"

Are there any other chassis changes between the models - for the record?

Cheers and thanks
------------------------------
JACK.