Black & Decker 243603-00 Line Trimmer Spool Spring Genuine Original Equipment Manufacturer (OEM) Part This part is compatible with models including; GH600TY1,90074526,GH500 TYPE 5,ST7700 TYPE 3,ST7700 TYPE 1,GH600TY2,ST7700 TYPE 2 This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including; 243603-00 Genuine Original Equipment Manufacturer (OEM) part. Compatible Brands: Black & Decker,Craftsman This spool spring (part number 243603-00) is for line trimmers Wear work gloves to protect your hands when installing this part