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Please understand, if you do, you may well start a business!
You will have to take it all apart, and then take either a file or a grind stone and resurface the blades.
I know you can learn this skill, if you do not know how, but this time it will take you to do it right will be hours, and if you charge a reasonable rate to do this for others, you may find it cheaper to buy a new one!
You may be able to find a web-site by looking on-line that will tell you exactly you to do this.
God bless your efforts.
Make sure that you are using the right battery, positioning it right to match how it goes the receptacle. Last thing is do not be afraid to give it a good push in there. New ones in particular have a firm seating which can take a little bit to get it in.
Hi Dan Walsh, When an electric motor won't start, it could be an open temperature device in the winding of the motor itself. If you have brushes and they are worn, then one or maybe two of the brushes can't stay inside the brush holder. They are spring loaded and if worn out can pop out. Also, if the winding are open, then there is not continuity. This will cause the condition you described. Not the best news, but it might answer your question.