People who tout the benefits of a 1.5" sickle just DO NOT understand the physics and mechanics of the way a reciprocating sickle cuts. When the knife is standing still at the ends of it's stroke, the machine has to move forward to fill the knife. The knife then moves and cuts off the material that has gathered there. If you put another guard in the middle of things, it just takes up room. Also, the knife is moving very slow when it is starting it's stroke, and you are asking it to begin cutting on the extra guard before it has gained any momentum or speed. Results will be very similar to an out of time sickle .... pulls hard, tears, plants drug out by their roots. My opinion is: it's largely a marketing thing. Just because the advertising boys say something, don't necessarily make it so. Ed in Montana