For making your own flywheel steel should do fine. You're probably not aiming for an 80,000+RPM flywheel that rides on magnetic bearings. So composites shouldn't be needed. The best material, eventually, for flywheels should be carbon nanotubes. They have huge tensional strength, but lousy compression strength. Tensile loads is what a flywheel has, so they'd work great.
It is important to note that not all batteries associated with these computer models are affected. The company is directing all users to its HP Battery Recall website to go through the online validation and replacement process.
Ford Motor Company (Ford) is conducting a limited regional recall for certain model year 2005-2007 Mustang, 2005-2006 GT and 2004 Ranger vehicles originally sold or currently registered in Florida, Puerto Rico, Hawaii and the U.S. Virgin Islands, and equipped with Takata-brand air bag inflators.ord Mustang Recalls. There have been 6 recalls on Mustang vehicles in recent years. The latest, dated 2015-06-02 and published by the NHTSA on 2015-06-27, was due to a problem with the tank assembly. Approximately 19095 vehicles were involved.