Abstract: A flying disk that allows for easier performance of tricks without degrading the flight performance of the flying disk. The flying disk includes a center opening over which a stretchable membrane is attached. This stretchable membrane deflects under the weight of the flying disk and helps in the performance of tricks that involve a spinning flying disk supported at its center by an object such as the finger of the person performing the trick. The stretchable membrane is replaceable with other membranes that allow various amounts of deflection and therefore require more or less skill to perform tricks with. Also the replaceable flexible membranes can be made in different colors or contains logos or designs. These variations allow the user of the flying disk to configure his or her own flying disk to their specific use, needs or liking.

Abstract: An end connector for double-pin track shoes or the like receives a pair of pins having arcuate grooves therein. The connector includes pin receiving openings having small diameter pin engaging arcuate surfaces, and large diameter arcuate grooves therebetween which nest arcuate portions of a spring therein. The spring also includes resiliently stressed portions that snap into the arcuate grooves in the pins when assembled, and a cap screw operatively connected between two walls of the connector clamps the connector onto the pins, thus providing double protection for maintaining the connector on the pins.