As others have pointed out the adhesion of the grinding wheel to the Roloc backing is poor. I've been using them for many years and up to 2020 they've been great. Last time I bought two packs and both had problems with the clutch. This made me go through the discs about twice as fast. I hope ABN can fix this. I'd love to keep using them, but apparently the composition has changed which is causing these issues. In earlier sets, this problem rarely occurred.
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