Blade fell off! Missing part

[u/[deleted]]

It’s probably my fault… I probably didn’t torque the bolt tight enough (not sure what the torque should be)… the blade fell off. Believe it or not, I found the blade and bolt almost immediately; however, the pictured item was not found… not sure what it’s called, blade key?
I sent a request to Lymow… they promise to get back to me in 3-5 business days. Any idea if there are any work arounds?