I had the same issue when I ordered mine for my OF1010. The older dust chute from the previous edge guide does not fit in the newer design edge guide for the OF1010. You have to purchase chip guard 445497. 445497 interestingly is the chip guard on the edge guide used with the OF1400 and OF2200. So if you have either of those routers, you can swap it out. Or you can purchase it as a parts replacement, or in my case, I found online retailers like ToolNut selling them.