Columbia Basin, Ephrata, WA | The inserts are rubber bars bonded to a rolled steel sheet that matches the curve of the concave. You remove the concaves, bolt the insert to them, then reinstall them and run them up so it has 0 clearance to the rotor. With new inserts you literally let the rotor chew into the rubber for a bit to make sure the clearance is tight enough. I don't remember if we backed down the concaves a little after burning them in or not. The rubber allows for aggressive enough threshing to separate the seed without destroying it, like running that close on steel would.
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combining clover seed
