Abstract: The apparatus comprises a spline inserting wheel, a motor for rotating the wheel, and a support mountable to a fixed structure having one end manually moveable over a frame supporting table surface. The wheel is rotatably mounted to one end of the support about an axis normal to the table surface, and a pneumatic cylinder applies a downward pressure on the wheel. The spline can be inserted into the frame by moving the support to locate the wheel over the groove and spline, applying pressure to the wheel to insert the spline into the groove, and driving the wheel to advance the wheel over the groove to insert the spline along the groove, while rotating the wheel about the normal axis to follow the groove.