The split sprockets have a notch on each half of the sprocket where they line up, the line is perpendicular to the cut. When I change sprockets I tighten the bolts up to where they touch the sprocket, but there’s still some play. Then I wrap the chain around the sprocket and pull it tight with the cut line on the sprocket perpendicular to the direction that I’m pulling the chain. And then snug every other bolt, then tighten the other three. I’m new to this too, but this method has worked. Last night I was in a rush to get a sprocket on and didn’t do this method, couldn’t get the chain lined up properly and had to go back and do it. Lessons learned, no shortcuts!