The invention provides a tee-enabled divot fixer having a cover. In a first reaction zone, 1,3-butadiene is reacted with hydrogen cyanide in the presence of a catalyst to produce pentenenitriles comprising 3-pentenenitrile and 2-methyl-3-butenenitrile. The undercover is inserted between the left and right side frames from above. The positioning portion positions the other end side of the pinion with respect to the output shaft side. The vapor-to-liquid phase transitions, or internal energy releases, can be provided about thin-film flexible structures for engaging body lumens and cavities.