Hi there learning a lot on here and just wondered is a crown guard really nessecary. I have one fitted to a large saw but find it awkward to use. Its clear plastic but makes it very difficult to see blade etc when using. The dust extraction is at the base of this saw. I always wear goggles etc when using it but I admit I have been using it raised up a fair bit to see but I noticed on another post mention of it being important.