This play isn't in the plate preload. Its the side to side tolerance of the flapper valve itself once the drums and bearings are installed. If there was no clearance everything would bind up quickly. If you want to confirm to yourself, pull the exhaust pipe back off and stick your finger in the exhaust port (lol) and wiggle it around flicking at the flapper (more lols). You'll notice a very metalic clack clack clack as it slaps around. Up to you to decide if there is excessive clearance in there, but remember that some play is part of the design.
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