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Why do I get scratches in the joint compound with the Nail Spotter?

Check the blade on the Nail Spotter to be sure there is no debris. Thoroughly clean the blade. You should also check to see if the blade has been damaged.  The carbide blades on TapeTech Nail Spotters are extremely durable but can be damaged if the tool repeatedly strikes the heads of screws or nails that were not properly set during drywall installation. If you need to replace the blade, use part number 600005F for the 63TT 2” Nail Spotter or part number 650005F for the 68TT 3” Nail Spotter.