I do see an issue here Kye.

The beauty of the post-war Australian pushies was the addition of a second
stay bar at the front. This gave a triangular rigidity to the chassis.

The Ogden had two cross bars at the front, and the bottom block (sole plate
and bottom blade) to join the two side frames. If you look at earlier designs
- Qualcast for example - there is only one cross bar at the front.

Your photo of the front roller shows a shaft with no threads.
Exactly how is the front roller attached to each side frame?

For me, a previous tenant has compromised the design.

An interesting mod.
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Jack