Instruct: Classify Amazon reviews into positive or negative sentiment
Query: not impressed with Drill Doctor

I bought the 750 Drill Doctor as I had accumulated heaps of dull drill bits over the years. I could not get the thing to work until I called the company and, after taking the unit apart, found that a plastic spring like thing was not properly in place. Once that was done the unit worked but only on bits larger than 1/8th inch. Called the company again and they advised how to tweek the unit for better results. Worked only slightly better.I feel the Drill Doctor is cheaply made with its plastic cams and spring.K. Klemm, Sharon Springs N.Y.