Abstract: A counterbalance system for a side load window assembly having a window sash and side frame jambs. A spring carriage is provided. The spring carriage has a first section that fits into a gap space between the window frame and the window sash. The spring carriage also includes a second section that passes under the window sash, therein supporting the window sash. At least one coil spring is provided. Each coil spring has a wound body that is held within the spring carriage. Each coil spring also has a first end that extends out of a housing and is anchored to one of the side frame jambs. The coil springs bias the spring housing upwardly. Since the window sash rests upon the housing, the window sash is counterbalanced.

Abstract: A racket assembly having a racket head that is supported by a handle. A string is strung across the racket head forming a string face. The string used in the string face is statistically likely to fail after the string face has been impacted a precalculated number of times. At least one sensor is provided for sensing when the racket head experiences a change in acceleration that exceeds a predetermined threshold level. A logic circuit creates a count corresponding to the number of times the sensor detects a change in acceleration in excess of the predetermined threshold level. An indicator is provided that creates an indication when the count approaches the precalculated number. In this manner, a person is warned when the string of the racket is statistically likely to fail.