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The TeacherGeek Reamer is one of the most useful
tools in our line. It allows you to reduce or remove the spline in the
holes found in connector strips, gears, wheels and perpendicular
blocks. Removing the spline allows a dowel to spin freely.
Spline (spln)
1. Any of a series of
projections on a shaft that fit into slots on a corresponding shaft,
enabling both to rotate together.
2. The groove or slot for such a
projection.
3. A wooden, pastic or metal strip; a
slat. | 
