I took a good look at my mower... looks like very little clearance between the blade tip and the front of the mower(side nearest me  and the tractor  /forums/images/graemlins/shocked.gif ) So, it seems to me that a chain guard --or anything else--might easily be pushed into the blade as I'm moving forward? /forums/images/graemlins/confused.gif   Do most mowers have more clearance up front?
Dumb question: do I need to have the opening on the front side of the mower, or can I bolt some sort of cover over it?  The underside of my tractor just got zinged by a small rock while mowing... /forums/images/graemlins/shocked.gif
luckily, it wasn't my head!!!  I've decided not to mow again until I have some sort of guard in place.