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Ray
If you would grind a slight flat surface on each of the drill bit flutes you will find it will work much better in plastic, this flat flutes will now cut like a spade bit in wood, and it will not grab or try to pull through as it exits the back side. I would suggest you might try the abbrasive stone on your dremel, I know you are using a small bit, I would recomend a good pair of magnifier eye glasses to see your flutes. Good luck Dennis
 
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