Please note: Some parts are not Manufacturer made. All standard parts (screws, orings, plastic nyliners, etc) are bought directly from USA distributors to reduce pricing for customers. All parts are guaranteed for fit and function. Fantastictools.com has sold and used these parts for more than 4 years without a single complaint. Customers have called to praise the part quality when compared to other brands. All parts are made to manufacturer's specifications and are produced to equal or surpass manufacturer's quality through tighter tolerances and better materials.