Yep, the auxiliary flywheel was needed to hold the clutch shoes.
I don't know how heavy it was, but there would have been some flywheel effect.
I'm still just asking the question - why the spacer was needed.

Deejay, not really.
No Victa Power Unit had the special low compression spacer.
That appears to be unique to the Imperial lawnmower.
Victa Power Units were really destined for non-Victa applications.

Cheers
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JACK

Here's a photo courtesy of Gizmo:-

[Linked Image]