> > How about a guard on the front of the unit that stops the 
> blade if it 
> > runs into something solid? It could be one unit or multiple smaller 
> > units so that if any one were pushed up your existing blade 
> clutch gets tripped.
> 
> There is a much easier way, it is used in agricultural 
> machines. A rake or rigid wires forms an apron at the front 
> of the machine, practically ploughing the ground. Each rake 
> finger is springed (strongly). When a few of those move (it 

That is what I was trying to get to....


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