On Friday, May 26, 2017 at 1:14:48 PM UTC-4, Bob wrote:
Hello,

Forgot to ask previously.

Is the Bolt that holds the blade on typically
counter, or reverse threaded ?

Have a several year old Toro Single Blade 22" walk behind lawnmower
Model 20005 (GTS Recycler):

Thanks,
Bob

I've never seen one that was reverse threaded.