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"This is the mower equivalent of the push up bra I guess, the blades lift and separate. :Haha"
Hello Leo and Contributors

I guess that's the tip of the iceberg.
The issue of the development of blades and blade holders is a topic in itself.

Victa, like all manufacturers, was part of the evolution of grass catching technology.
When they introduced their catcher mowers their solution was to offer the 'traditional'
cutting blades and added two lifting blades (as Mod Gadge has said).

Victa would quickly learn that these two functions could be combined into the fluted
cutting blade. That is what we have today. To a degree, any mower with a skirt and
fluted blades (or flutes built into the bladeholder) could be considered a 'mulcher';
in that grass may be cut multiple times before discharge ...

Your fourth photo (above) seems to show that the jet ramp (for catching) has become
dislodged. This needs to be re-attached.

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"Oh, how exactly would I identify the engine in this machine?"
More correctly, the first Mayfair had three different variants of the same engine.
I hope to deal with that topic tomorrow.

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"This is to be my regular use mower, not a collectable."
Yep, that's awesome. It should deliver faithful service.

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"To the air filter, does anyone know whether it's supposed to actually have a filter in the enclosure or is the mesh sides the filtering?"

The mesh sides are the only filtering agent!
This is really all engines had before better filtering systems.
The Mayfair, being a 'stencil' brand was originally fitted with old technology.
This would quickly change.

I feel you need to change the filtration; given this is a daily driver.
A member may be able to help with the cartridge design that would work with
the particular engine and carby specifications.

The cap? I guess you mean the 'petrol' cap?
http://www.ebay.com.au/itm/victa18-fuel-cap-/251105828829

Hope this helps.
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Jack