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Whew! Many different designs, don't get mad if we have all different ideas on this. They should touch the side you plan on, but not touch it so hard they wear. The older (in my opinion better) designs they were allowed to flex in to the shaft & out to the edge of the blade. The new ones are fixed to the outer edge of the blade, so the inside can still cake up. They should be adjustable so you can place each one just barely touching the blade - as they wear you might need to adjust. Do you have a farm scrap yard around you, pick up an old disk for the scrapers & use those. Here's a problem: The skinnier the scrapers are, the less they will do for you. The wider they are, the more likely they will gum up with mud & trash & stop the disk from turning. When the scrapers fall off our old disks, a lot of folks loop a chain (old wore out roller chain even) over the frame of the disk & under the disk axle where the scraper is missing. This somewhat loose & flopping chain prevents mud build up. I'm not sure you want to do that for each & every blade, but it's a simple solution. Mud with clay & a disk are a difficult combination. I know exactly where you are coming from. A couple of wet years, I planted 200 acres with a 3pt single gang Dearborn as the only tillage tool - too wet to get anything else in. An old car leaf spring became my friend, to clean that disk almost every round. --->Paul
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