WHEN a mechanic desires to enlarge by several thousandths of an inch a hole which has already been reamed with a standard reamer, he can readily do so by wrapping paper around the tool, covering about three-quarters of its circumference and Enlarging a reamed hole. leaving several cutting edges bare. The paper should be carried around with the reamer when the tool is in use. Graphite or the lead of a pencil should be rubbed on the outer surface of the paper to serve as a lubricant when the reamer is rotated.