How to re-attach blade in Ozito twin battery lawn mower?

[Hermitcrab]

Hi I recently bought a ozito twin battery mower

I have used it several times and it perfect for me and lightweight

As I was mowing,  I stopped to empty the catcher and the blade  fell off.

I have tried to put it back on, but it keep flying off ( so dangerous)

I've got the blade, the bolt and a little spri ng washer, 

Is there another part that is missing and does it just screw in .

Thanks for your help 

[Jason]

Hi @Hermitcrab,

That does sound very dangerous so we would you advise you to stop using the mower and return it to your local store. 

Please let us know if you need @EricL to assist with the return. He will be back on the site this afternoon.

Jason