The art and knowledge of knowing what can be modified from one part configuration to make another configuration can frequently be an important asset. As you might expect in maintenance we are often called upon to study such possibilities and frequently called upon to perform such modifications. Often the knowledge of what can be modified comes from the Production Authorization Holders (PAH) in the form of Service Letters and Service Bulletins. However, these documents do not complete the story of what can be modified. There is hidden in technical data all sorts of modifications that can only be determined by years of experience and physical handling of the product. If you are in need of a rotatable or repairable part and have exhausted your sources of supply you may wish to seek our help to modify something you have to what you need.