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Typically, a cutting disc can be hard to remove because the locking nut was overtightened when fitted to the grinder. A disc will tighten under loading, so excessive tightening will cause issues with removal, that may require a pin spanner or wrench to remove it. 

To properly fit and remove the disc, depending on your model, see: 

• How to fit and remove Angle Grinder disc using a tool free locking nut (R18AG7-0, RAG18X, R18AG1, R18AG15)
• How to fit and remove Angle Grinder disc using pin spanner (R18AG4115-0, R18AG14, RAG80125-G, EAG75100-G, EAG2023RG)