How do I assemble this hoover - Dyson DC40 Multi Floor Upright Vacuum

Yes, they are everywhere including Walmart and eBay.

Replacement for Hoover Windtunnel UH70400 Brush Roller ...

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Replacement for Hoover Windtunnel UH70400 Brush Roller Fits UH70400 Air Bagless Upright, Compatible with Part # 303792001, by Think Crucial: ...
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Hoover UH70400 Wind Tunnel Air Brushroll Assembly ...

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Replacement Brush Roller, Fits Hoover UH70400 Windtunnel ...

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Replacement Brush Roller, Fits Hoover UH70400 Windtunnel Air Bagless ... A brush roller on your vacuum is really like a broom for your carpet, that gets all the ...

HUNDREDS here!

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http://www.hoover.com/pdfs/manuals/H3000.pdf
this can be good for you solution

hoover vacuum cleaner front wheel assy YouTube

Just pull the brush assembly straight out slightly and look for 4
release tabs....squeeze the tabs and pull the assembly out. Make
sure cord is not plugged in.

Regards,
Dennis

Hoover S3865 Cyclonic Bagless Canister Vacuum Parts

Pivot assembly is page B number 3, B3

They show the part is obsolete and out of stock.
You may want to keep the epoxy fix.

Remove the screws that hold the upper handle assembly onto the body of the vacuum. The upper handle assembly will slide off the back to reveal the power switch

this link may help you
http://www.ereplacementparts.com/hoover-h3030-floormate-spinscrub-500-parts-c-37315_37405_37409.html

You should be able to purchase one from any Hoover dealer. Cost of this part is about $5 USD. The wheels and axles do not come with it, but need to be installed into the new one. Hoover.com you can lookup your nearest dealer.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_b96ba3f038cf317c

The Tempo series cleaners look similar, but are different colors. The wheel assemblies will work if they look identical in appearance to yours.

The hoover series sometimes has a belt driven gear or a plastic gear assembly that gets worn out. You may have to replace one or the other to see if this does the trick. Becareful not to loose the little screws that holds the assembly in place. Some models has a clip that holds it all together, some do not have any of them at all.