Quoted from Yoko2una:Replace them. I kept hearing everyone say to toss Stern balls out, and then I saw this last week in an IMDN Prem on location.
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We use these in our games - https://ksarcade.net/new-used-pinball-boards-parts/balls-fuses-other/balls/turbo-shotz-magna-shotz-premium-pinballs-1-1-16-5-pk.html
Golf anybody. That is bad, hardness check, quality control.