On Fri, 26 May 2017 13:14:44 -0400
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

Try one way and if you fail go the other.