G'day all
It is fantastic that members help out other members.
A big thank you to Paul for the thoughtful images...
I mean,a contrasting background that gives great detail.
I think 4-5 mm diameter might be a tad large...?
From what I think vint-mow is saying, this was a static screen,
not affixed to the flywheel, but supported and held by the sandwich
between the cowling and the starter assembly.
This is an interesting post because it concerns the minutiae or
detail of quality restorations of the EC-B SC engine.
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Jack