The stock levers use a bushing on the end to prevent that. These do not use that and the aluminum gets ovalled out over time. You could try to modify the lever to use a bushing to take up the play.... or buy a set of stock levers.
Myself, I prefer using the stock parts and not having my bike look like advertisement for cheap eBay parts. That said, they are all going to have a little play to prevent binding. Next time you are at a motorcycle dealer, check out the levers of the bikes on the floor.
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