Golfsmith Ultralight Shaft Extender: Extenders for ultralight graphite shafts. Golfsmiths versatile selection of shaft extenders (plugs) will lengthen virtually any golf club on the market. Simply apply epoxy, slide the extender into the shaft butt, allow the epoxy to cure and cut to length. Dimensions: Tip diameter: .535 Butt diameter: .610 Note: Extending a club more than two inches may compromise shaft integrity and increase the risk of breakage.