With tool unplugged rotate tool end with your finger tips if it gives any resistance to this your bearings have forign material in them (happens if your doing grinding allot) if a liberal dose of light oil (sewing machine) does not improve this friction im sorry but you;ll have to replace tool to run slower speeds
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With tool unplugged rotate tool end with your finger tips if it gives any resistance to this your bearings have forign material in them (happens if your doing grinding allot) if a liberal dose of light oil (sewing machine) does not improve this friction im sorry but you;ll have to replace tool to run slower speeds