Assuming you don't have a lathe to turn them, I've used rubber washers and I've used small corks from the craft store, but honestly I've just quit putting lip stops on Jordans and wingbones. Don't really seem to help or hurt on those calls for me. Can't remember the exact size of the washer but Ralph Permar still uses them on some of his low end Jordans. I'll try to go look here in a little while and see what size they are.
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